I can't tell if HTML code that creates a pop-up window for my website is working correctly or not

Greetings EE,

A subcontractor I hired through oDesk has just completed a project which involves implementing a pop-up window on my website to offer visitors an option to sign up for my newsletter. There is a cookie in the newsletter so that the pop-up should only appear every 7 days (I think it is 7 days anyway) if the visitor returns.

The subcontractor has XP on his system and I have Windows 7 home premium on my computer. I've tested it on Firefox and Internet Explorer (the latest release of both) and it works fine in IE, but not in Firefox (at least IN MY VERSION OF FIREFOX).

On my version of Firefox, even though I verify that the cookie does exist, the pop-up displays every single time I go to my site, which is considerably more frequent than every 7 days. I brought this up to the subcontractor and he tested it, finding that on his XP system, it is working perfectly in both browsers.

I'm including the original HTML code

<!-- Pop over code - developed by Affilorama http://www.affilorama.com -->
<script type="text/javascript">
	function popOver()
	{
		setTimeout('showPopOver()',12 * 1000) ;
	}
	function showPopOver()
	{
		var popc=document.getElementById('PopOverBox') ;
		popc.style.visibility = 'visible' ;
	}
	function hidePopOver()
	{
		var popc=document.getElementById('PopOverBox') ;
		popc.style.visibility='hidden' ;
	}
</script>

<script type="text/javascript">
var expDays = 9; // number of days the cookie should last

function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
    return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
  }
  return null;
}

function SetCookie (name, value) {
  var argv = SetCookie.arguments;
  var argc = SetCookie.arguments.length;
  var expires = (argc > 2) ? argv[2] : null;
  var path = (argc > 3) ? argv[3] : null;
  var domain = (argc > 4) ? argv[4] : null;
  var secure = (argc > 5) ? argv[5] : false;
  document.cookie = name + "=" + escape (value) +
    ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
    ((path == null) ? "" : ("; path=" + path)) +
    ((domain == null) ? "" : ("; domain=" + domain)) +
    ((secure == true) ? "; secure" : "");
}

function DeleteCookie (name) {
  var exp = new Date();
  exp.setTime (exp.getTime() - 1);
  var cval = GetCookie (name);
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var exp = new Date();
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

function amt(){
  var count = GetCookie('countingDays')
  if(count == null) {
    SetCookie('countingDays','1')
    return 1
  } else {
    var newcount = parseInt(count) + 1;
    DeleteCookie('countingDays')
    SetCookie('countingDays',newcount,exp)
    return count
  }
}

function getCookieVal(offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
  endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
</script>

<style type="text/css">
	.PopOverBox {
		background-repeat:no-repeat;
		visibility: hidden ;
		width: 450px ;
		height: 450px ;
		z-index: 999999 ;
		position: fixed ;
		top: 20% ;
		left:20% ;
	}
	.PopOverClose a	{
		color:#000000;
		background:transparent url(images/close_simple_overlay.png) no-repeat top left;
		cursor:pointer;
		display:block;
		margin:0;
		position:absolute;
		text-decoration:none;
		z-index:20;
		width:36px;
		height:36px;
		top:-15px;
		right:-15px;
	}
	.PopOverContent	{}
</style>
<!-- Pop over code ends -->
<!-- Pop over code - developed by Affilorama http://www.affilorama.com -->

<style type="text/css">
#container { 
	margin: 0; 
	padding: 0; 
	position: relative; 
	width: 450px;
	height:450px; 
	text-align: left; 
	font-family: "MS Trebuchet", Trebuchet, "Trebuchet MS", Tahoma, Arial, Helvetica, sans-serif; 
	font-size: 12px;
	background-color:transparent;
	color:#000000;
}

.clearfloat {
	clear:both;
    height:0;
    font-size: 1px;
    line-height: 0px;
}

#topBox { 
	margin:0; 
	padding: 0; 
	width: 450px; 
	height:12px; 
	background:transparent url(images/top_round_corners_border.png) no-repeat top left;
}

#bottomBox { 
	margin:0; 
	padding: 0; 
	width: 450px; 
	height:12px; 
	background:transparent url(images/bottom_round_border.png) no-repeat bottom left;
}

#mainContent {
	margin:0; 
	padding: 0 8px 0 8px; 
	width: 434px; 
	height:426px;
	background:#fff8a9 url(images/middle_border.png) repeat-y top left;
	position:relative;
	z-index:1;
}

#logo {
	margin:0; 
	padding: 0; 
	width: 434px; 
	height:29px; 
	background:transparent url(images/newsletter_logo.png) no-repeat center top;
	position:relative;
	z-index:5;
}

#newsletterImage {
	float:left;
	margin:30px 10px 12px 8px; 
	padding: 0; 
	width: 144px; 
	height:232px; 
	background:transparent url(images/group-image-new.png) no-repeat left top;
	position:relative;
	z-index:5;
}

#contentBox {
	float:left;
	margin:30px auto auto 0; 
	padding: 2px 18px 10px 12px; 
	width: 241px; 
	height:220px; 
	background:transparent url(images/content_box_bg.png) no-repeat left top;
	color:#fcd004;
	font-size:14px;
	position:relative;
	z-index:5;
}

#contentBox a.classLink01 {
	color:#fcd004;
	font-size:14px;
	font-weight:bold;
	text-decoration:none;
	border-bottom:1px dotted #fcd004;
}

#contentBox a.classLink01:hover {
	text-decoration:none;
	font-weight:bold;
	border-bottom:1px solid #fcd004;
}

#contentBox p {
	margin: 1em 0 1em 0;
}

#contentBox ol {
	display: block;
	margin: 1em 0 1em 0;
	padding-left: 30px;
	list-style-type: decimal;
	list-style-position:outside;
}

#contentBox ol li {

}

#badgeFree {
	background:transparent url(images/free-badge_03.png) no-repeat center top;
	width:74px;
	height:74px;
	position:absolute;
	left:188px;
	top:6px;
	z-index:3;
}

#formBox {
	margin:4px auto 3px auto; 
	padding: 8px 11px 12px 5px; 
	width: 374px; 
	height:98px; 
	background:transparent url(images/form_bg.png) no-repeat left top;
	color:#fcd004;
	font-size:11px;
}
#formInner {
	width: 374px;   /* was 358 */
	height:98px;   /* was 78 */
	margin:0;
	padding:0;
}
.columnOne {
	float:left;
	width:172px;
	display:block;
}
.columnTwo {
	float:left;
	width:198px;
	display:block;
}
.cell-1 {
	width:165px;
	height:34px;
	display:block;
	float:left;
	margin:5px 0 0 7px;
	padding:0;
}
.cell-1 input {
	background:transparent url(images/input_bg.png) no-repeat left top;
	width:149px;
	height:26px;
	font-family:Georgia, "Times New Roman", Times, serif;
	font-size:22px;
	font-weight:bold;
	color:#acacac;
	padding:4px 8px 4px 8px;
	border:none;
	line-height:26px;
}

.cell-2 {
	width:165px;
	height:34px;
	display:block;
	float:left;
	margin:10px 0 0 7px;
	padding:0;
}
.cell-2 input {
	background:transparent url(images/input_bg.png) no-repeat left top;
	width:149px;
	height:26px;
	font-family:Georgia, "Times New Roman", Times, serif;
	font-size:22px;
	font-weight:bold;
	color:#acacac;
	padding:4px 8px 4px 8px;
	border:none;
	line-height:26px;
}

.cell-3 {
	width:132px;
	height:31px;
	display:block;
	float:left;
	margin:5px 0 0 20px;
	padding:0;
}
.cell-3 input {
	background:transparent url(images/subscribe_button.png) no-repeat center center;
	width:132px;
	height:31px;
	font-family:Verdana, Arial, Helvetica, sans-serif;
	font-size:20px;
	color:#fcd004;
	padding:2px 5px 4px 5px;
	border:none;
	line-height:24px;
	text-align:center;
	cursor:pointer;
}
.cell-4 {
	width:186px;
	display:block;
	float:left;
	margin:5px 0 0 9px;
	padding:0;
}

   /********** in this style declaration you can change the aspect of the small text inside the form *********/
.cell-4 p {
	margin:0;
	font-size:11px;  /* here you can change the size of the small text */
	font-weight:bold;   /* here you can put 'bold' if you want to have the text bold */
	color:#FFFFFF;  /* here you can change the color of the small text */
	line-height:13px; 
	margin-bottom:3px;
	padding:0;
}

#formBox input:focus {
	outline:none;
}
</style>

<!--[if IE 7]>
<style type="text/css">
.cell-1 {
	background:transparent url(images/input_bg.png) no-repeat 0 0;
}
.cell-1 input {
	background-color:transparent;
    background-image:none;
}
.cell-2 {
	background:transparent url(images/input_bg.png) no-repeat 0 0;
}
.cell-2 input {
	background-color:transparent;
    background-image:none;
}
.cell-4 p {
	margin:0 0 0 7px;
}
</style>
<![endif]-->


<script type="text/javascript">
function remName(a, b){
			if(a.value==b){
				a.value='';
			}else
				if(a.value==''){
					a.value=b;
				}else{
					a.value=a.value;
				}
		}
 
function chkName(a, b){
		if(a.value==''){
			a.value=b;
		}else{
			a.value=a.value;
		}
	}
</script>


<div class="PopOverBox" id="PopOverBox" name="PopOverBox">
    <div class="PopOverClose">
    		<a onclick="Javascript: document.getElementById('PopOverBox').style.visibility='hidden' ;"></a>
    </div>
<div id="container" class="PopOverContent">
    <div id="topBox"></div>
	<div id="mainContent">
    	
        <div id="logo"></div>
        <div id="badgeFree"></div>
      <div id="newsletterImage"></div>
        <div id="contentBox">
        	<p>Have a digital camera? Discover how to take pictures like this! <strong>Subscribe to our free newsletter and receive</strong>:</p>
			
            <ol>
              <li>Easy-to-apply photography tips</li>
              <li>Free photo-related software programs</li>
              <li>A free <a href="http://www.best-family-photography-tips.com/photography-newsletter2.html" class="classLink01" target="_blank">Photography Checklist E-Book</a>, so you are always prepared for any photographic event</li>
            </ol>
        </div><!-- ending contentBox -->
        
        <br class="clearfloat" />
        
        <div id="formBox">
        	
            <form action="http://www.best-family-photography-tips.com/cgi-bin/mailout/mailmgr.cgi" method="post">
            	<input type="hidden" name="list_id" value="6810"/>
                <input type="hidden" name="action" value="subscribe"/>
                <div id="formInner">
                	<div class="columnOne">
                    <div class="cell-1">
                        <input name="name" type="text" value="First Name" onfocus="remName(this, 'First Name');" onblur="chkName(this, 'First Name');" />
                    </div>
                    <div class="cell-2">
                    	<input name="email" type="text" value="E-mail" onfocus="remName(this, 'E-mail');" onblur="chkName(this, 'E-mail');" />
                    </div>
                    </div><!-- ending columnOne -->
                    <div class="columnTwo">
                    <div class="cell-3">
                    	<input class="subscribeClass" name="SUBMIT" type="submit" value="Subscribe" />
                    </div>
                    <div class="cell-4">
                    	<p>Enter your name and email to subscribe.</p>
                    	<p>We respect and protect  your privacy.</p>
                    </div>
                    </div><!-- ending columnTwo -->
                </div><!-- ending formInner -->
                
            </form>
        </div><!-- ending formBox -->
    </div>
<!-- ending mainContent -->
    <div id="bottomBox"></div>
    </div><!-- ending container -->
</div><!-- ending PopOverBox -->
<script type="text/javascript">
<!--
function checkCount() {
  var count = GetCookie('countingDays');
  if (count == null) {
    count=1;
    SetCookie('countingDays', count, exp);
    popOver(); 
  } else {
    count++;
    SetCookie('countingDays', count, exp);
  }
}

window.onload=checkCount;
-->
</script>
<!-- Pop over body ends -->

Select allOpen in new window

for the pop-up (supplied by the subcontractor) as well as the JavaScript I converted his HTML code into.

inc_newsletterpopup_js =
'<!-- Pop over code - developed by Affilorama http://www.'
+ 'affilorama.com -->\n<script type="text/javascript">\n	func'
+ 'tion popOver()\n	{\n		setTimeout(\'showPopOver()\',7 * 1000'
+ ') ;\n	}\n	function showPopOver()\n	{\n		var popc=document.ge'
+ 'tElementById(\'PopOverBox\') ;\n		popc.style.visibility = \''
+ 'visible\' ;\n	}\n	function hidePopOver()\n	{\n		var popc=docu'
+ 'ment.getElementById(\'PopOverBox\') ;\n		popc.style.visibil'
+ 'ity=\'hidden\' ;\n	}\n</script>\n\n<script type="text/javascri'
+ 'pt">\nvar expDays = 9; // number of days the cookie shoul'
+ 'd last\n\nfunction GetCookie (name) {\n  var arg = name + "'
+ '=";\n  var alen = arg.length;\n  var clen = document.cooki'
+ 'e.length;\n  var i = 0;\n  while (i < clen) {\n    var j = '
+ 'i + alen;\n    if (document.cookie.substring(i, j) == arg'
+ ')\n    return getCookieVal (j);\n    i = document.cookie.i'
+ 'ndexOf(" ", i) + 1;\n    if (i == 0) break;\n  }\n  return '
+ 'null;\n}\n\nfunction SetCookie (name, value) {\n  var argv ='
+ ' SetCookie.arguments;\n  var argc = SetCookie.arguments.l'
+ 'ength;\n  var expires = (argc > 2) ? argv[2] : null;\n  va'
+ 'r path = (argc > 3) ? argv[3] : null;\n  var domain = (ar'
+ 'gc > 4) ? argv[4] : null;\n  var secure = (argc > 5) ? ar'
+ 'gv[5] : false;\n  document.cookie = name + "=" + escape ('
+ 'value) +\n    ((expires == null) ? "" : ("; expires=" + e'
+ 'xpires.toGMTString())) +\n    ((path == null) ? "" : ("; '
+ 'path=" + path)) +\n    ((domain == null) ? "" : ("; domai'
+ 'n=" + domain)) +\n    ((secure == true) ? "; secure" : ""'
+ ');\n}\n\nfunction DeleteCookie (name) {\n  var exp = new Dat'
+ 'e();\n  exp.setTime (exp.getTime() - 1);\n  var cval = Get'
+ 'Cookie (name);\n  document.cookie = name + "=" + cval + "'
+ '; expires=" + exp.toGMTString();\n}\n\nvar exp = new Date()'
+ ';\nexp.setTime(exp.getTime() + (expDays*24*60*60*1000));\n'
+ '\nfunction amt(){\n  var count = GetCookie(\'countingDays\')'
+ '\n  if(count == null) {\n    SetCookie(\'countingDays\',\'1\')'
+ '\n    return 1\n  } else {\n    var newcount = parseInt(cou'
+ 'nt) + 1;\n    DeleteCookie(\'countingDays\')\n    SetCookie('
+ '\'countingDays\',newcount,exp)\n    return count\n  }\n}\n\nfun'
+ 'ction getCookieVal(offset) {\n  var endstr = document.coo'
+ 'kie.indexOf (";", offset);\n  if (endstr == -1)\n  endstr '
+ '= document.cookie.length;\n  return unescape(document.coo'
+ 'kie.substring(offset, endstr));\n}\n</script>\n\n<style type'
+ '="text/css">\n	.PopOverBox {\n		background-repeat:no-repea'
+ 't;\n		visibility: hidden ;\n		width: 450px ;\n		height: 450'
+ 'px ;\n		z-index: 999999 ;\n		position: fixed ;\n		top: 20% '
+ ';\n		left:20% ;\n	}\n	.PopOverClose a	{\n		color:#000000;\n		'
+ 'background:transparent url(images/close_simple_overlay.p'
+ 'ng) no-repeat top left;\n		cursor:pointer;\n		display:bloc'
+ 'k;\n		margin:0;\n		position:absolute;\n		text-decoration:no'
+ 'ne;\n		z-index:20;\n		width:36px;\n		height:36px;\n		top:-15'
+ 'px;\n		right:-15px;\n	}\n	.PopOverContent	{}\n</style>\n<!-- '
+ 'Pop over code ends -->\n<!-- Pop over code - developed by'
+ ' Affilorama http://www.affilorama.com -->\n\n<style type="'
+ 'text/css">\n#container { \n	margin: 0; \n	padding: 0; \n	pos'
+ 'ition: relative; \n	width: 450px;\n	height:450px; \n	text-a'
+ 'lign: left; \n	font-family: "MS Trebuchet", Trebuchet, "T'
+ 'rebuchet MS", Tahoma, Arial, Helvetica, sans-serif; \n	fo'
+ 'nt-size: 12px;\n	background-color:transparent;\n	color:#00'
+ '0000;\n}\n\n.clearfloat {\n	clear:both;\n    height:0;\n    fo'
+ 'nt-size: 1px;\n    line-height: 0px;\n}\n\n#topBox { \n	margi'
+ 'n:0; \n	padding: 0; \n	width: 450px; \n	height:12px; \n	back'
+ 'ground:transparent url(images/top_round_corners_border.p'
+ 'ng) no-repeat top left;\n}\n\n#bottomBox { \n	margin:0; \n	pa'
+ 'dding: 0; \n	width: 450px; \n	height:12px; \n	background:tr'
+ 'ansparent url(images/bottom_round_border.png) no-repeat '
+ 'bottom left;\n}\n\n#mainContent {\n	margin:0; \n	padding: 0 8'
+ 'px 0 8px; \n	width: 434px; \n	height:426px;\n	background:#f'
+ 'ff8a9 url(images/middle_border.png) repeat-y top left;\n	'
+ 'position:relative;\n	z-index:1;\n}\n\n#logo {\n	margin:0; \n	p'
+ 'adding: 0; \n	width: 434px; \n	height:29px; \n	background:t'
+ 'ransparent url(images/newsletter_logo.png) no-repeat cen'
+ 'ter top;\n	position:relative;\n	z-index:5;\n}\n\n#newsletterI'
+ 'mage {\n	float:left;\n	margin:30px 10px 12px 8px; \n	paddin'
+ 'g: 0; \n	width: 144px; \n	height:232px; \n	background:trans'
+ 'parent url(images/group-image-new.png) no-repeat left to'
+ 'p;\n	position:relative;\n	z-index:5;\n}\n\n#contentBox {\n	flo'
+ 'at:left;\n	margin:30px auto auto 0; \n	padding: 2px 18px 1'
+ '0px 12px; \n	width: 241px; \n	height:220px; \n	background:t'
+ 'ransparent url(images/content_box_bg.png) no-repeat left'
+ ' top;\n	color:#fcd004;\n	font-size:14px;\n	position:relativ'
+ 'e;\n	z-index:5;\n}\n\n#contentBox a.classLink01 {\n	color:#fc'
+ 'd004;\n	font-size:14px;\n	font-weight:bold;\n	text-decorati'
+ 'on:none;\n	border-bottom:1px dotted #fcd004;\n}\n\n#contentB'
+ 'ox a.classLink01:hover {\n	text-decoration:none;\n	font-we'
+ 'ight:bold;\n	border-bottom:1px solid #fcd004;\n}\n\n#content'
+ 'Box p {\n	margin: 1em 0 1em 0;\n}\n\n#contentBox ol {\n	displ'
+ 'ay: block;\n	margin: 1em 0 1em 0;\n	padding-left: 30px;\n	l'
+ 'ist-style-type: decimal;\n	list-style-position:outside;\n}'
+ '\n\n#contentBox ol li {\n\n}\n\n#badgeFree {\n	background:trans'
+ 'parent url(images/free-badge_03.png) no-repeat center to'
+ 'p;\n	width:74px;\n	height:74px;\n	position:absolute;\n	left:'
+ '188px;\n	top:6px;\n	z-index:3;\n}\n\n#formBox {\n	margin:4px a'
+ 'uto 3px auto; \n	padding: 8px 11px 12px 5px; \n	width: 374'
+ 'px; \n	height:98px; \n	background:transparent url(images/f'
+ 'orm_bg.png) no-repeat left top;\n	color:#fcd004;\n	font-si'
+ 'ze:11px;\n}\n#formInner {\n	width: 374px;   /* was 358 */\n	'
+ 'height:98px;   /* was 78 */\n	margin:0;\n	padding:0;\n}\n.co'
+ 'lumnOne {\n	float:left;\n	width:172px;\n	display:block;\n}\n.'
+ 'columnTwo {\n	float:left;\n	width:198px;\n	display:block;\n}'
+ '\n.cell-1 {\n	width:165px;\n	height:34px;\n	display:block;\n	'
+ 'float:left;\n	margin:5px 0 0 7px;\n	padding:0;\n}\n.cell-1 i'
+ 'nput {\n	background:transparent url(images/input_bg.png) '
+ 'no-repeat left top;\n	width:149px;\n	height:26px;\n	font-fa'
+ 'mily:Georgia, "Times New Roman", Times, serif;\n	font-siz'
+ 'e:22px;\n	font-weight:bold;\n	color:#acacac;\n	padding:4px '
+ '8px 4px 8px;\n	border:none;\n	line-height:26px;\n}\n\n.cell-2'
+ ' {\n	width:165px;\n	height:34px;\n	display:block;\n	float:le'
+ 'ft;\n	margin:10px 0 0 7px;\n	padding:0;\n}\n.cell-2 input {\n'
+ '	background:transparent url(images/input_bg.png) no-repe'
+ 'at left top;\n	width:149px;\n	height:26px;\n	font-family:Ge'
+ 'orgia, "Times New Roman", Times, serif;\n	font-size:22px;'
+ '\n	font-weight:bold;\n	color:#acacac;\n	padding:4px 8px 4px'
+ ' 8px;\n	border:none;\n	line-height:26px;\n}\n\n.cell-3 {\n	wid'
+ 'th:132px;\n	height:31px;\n	display:block;\n	float:left;\n	ma'
+ 'rgin:5px 0 0 20px;\n	padding:0;\n}\n.cell-3 input {\n	backgr'
+ 'ound:transparent url(images/subscribe_button.png) no-rep'
+ 'eat center center;\n	width:132px;\n	height:31px;\n	font-fam'
+ 'ily:Verdana, Arial, Helvetica, sans-serif;\n	font-size:20'
+ 'px;\n	color:#fcd004;\n	padding:2px 5px 4px 5px;\n	border:no'
+ 'ne;\n	line-height:24px;\n	text-align:center;\n	cursor:point'
+ 'er;\n}\n.cell-4 {\n	width:186px;\n	display:block;\n	float:lef'
+ 't;\n	margin:5px 0 0 9px;\n	padding:0;\n}\n\n   /********** in'
+ ' this style declaration you can change the aspect of the'
+ ' small text inside the form *********/\n.cell-4 p {\n	marg'
+ 'in:0;\n	font-size:11px;  /* here you can change the size '
+ 'of the small text */\n	font-weight:bold;   /* here you ca'
+ 'n put \'bold\' if you want to have the text bold */\n	color'
+ ':#FFFFFF;  /* here you can change the color of the small'
+ ' text */\n	line-height:13px; \n	margin-bottom:3px;\n	paddin'
+ 'g:0;\n}\n\n#formBox input:focus {\n	outline:none;\n}\n</style>'
+ '\n\n<!--[if IE 7]>\n<style type="text/css">\n.cell-1 {\n	back'
+ 'ground:transparent url(images/input_bg.png) no-repeat 0 '
+ '0;\n}\n.cell-1 input {\n	background-color:transparent;\n    '
+ 'background-image:none;\n}\n.cell-2 {\n	background:transpare'
+ 'nt url(images/input_bg.png) no-repeat 0 0;\n}\n.cell-2 inp'
+ 'ut {\n	background-color:transparent;\n    background-image'
+ ':none;\n}\n.cell-4 p {\n	margin:0 0 0 7px;\n}\n</style>\n<![en'
+ 'dif]-->\n\n\n<script type="text/javascript">\nfunction remNa'
+ 'me(a, b){\n			if(a.value==b){\n				a.value=\'\';\n			}else\n		'
+ '		if(a.value==\'\'){\n					a.value=b;\n				}else{\n					a.val'
+ 'ue=a.value;\n				}\n		}\n \nfunction chkName(a, b){\n		if(a.v'
+ 'alue==\'\'){\n			a.value=b;\n		}else{\n			a.value=a.value;\n		'
+ '}\n	}\n</script>\n\n\n<div class="PopOverBox" id="PopOverBox"'
+ ' name="PopOverBox">\n    <div class="PopOverClose">\n    	'
+ '	<a onclick="Javascript: document.getElementById(\'PopOve'
+ 'rBox\').style.visibility=\'hidden\' ;"></a>\n    </div>\n<div'
+ ' id="container" class="PopOverContent">\n    <div id="top'
+ 'Box"></div>\n	<div id="mainContent">\n    	\n        <div i'
+ 'd="logo"></div>\n        <div id="badgeFree"></div>\n     '
+ ' <div id="newsletterImage"></div>\n        <div id="conte'
+ 'ntBox">\n        	<p>Have a digital camera? Discover how '
+ 'to take pictures like this! <strong>Subscribe to our fre'
+ 'e newsletter and receive</strong>:</p>\n			\n            <'
+ 'ol>\n              <li>Easy-to-apply photography tips</li'
+ '>\n              <li>Free photo-related software programs'
+ '</li>\n              <li>A free <a href="http://www.best-'
+ 'family-photography-tips.com/photography-newsletter2.html'
+ '" class="classLink01" target="_blank">Photography Checkl'
+ 'ist E-Book</a>, so you are always prepared for any photo'
+ 'graphic event</li>\n            </ol>\n        </div><!-- '
+ 'ending contentBox -->\n        \n        <br class="clearf'
+ 'loat" />\n        \n        <div id="formBox">\n        	\n '
+ '           <form action="http://www.best-family-photogra'
+ 'phy-tips.com/cgi-bin/mailout/mailmgr.cgi" method="post">'
+ '\n            	<input type="hidden" name="list_id" value='
+ '"6810"/>\n                <input type="hidden" name="acti'
+ 'on" value="subscribe"/>\n                <div id="formInn'
+ 'er">\n                	<div class="columnOne">\n          '
+ '          <div class="cell-1">\n                        <'
+ 'input name="name" type="text" value="First Name" onfocus'
+ '="remName(this, \'First Name\');" onblur="chkName(this, \'F'
+ 'irst Name\');" />\n                    </div>\n            '
+ '        <div class="cell-2">\n                    	<input'
+ ' name="email" type="text" value="E-mail" onfocus="remNam'
+ 'e(this, \'E-mail\');" onblur="chkName(this, \'E-mail\');" />'
+ '\n                    </div>\n                    </div><!'
+ '-- ending columnOne -->\n                    <div class="'
+ 'columnTwo">\n                    <div class="cell-3">\n   '
+ '                 	<input class="subscribeClass" name="SU'
+ 'BMIT" type="submit" value="Subscribe" />\n               '
+ '     </div>\n                    <div class="cell-4">\n   '
+ '                 	<p>Enter your name and email to subscr'
+ 'ibe.</p>\n                    	<p>We respect and protect '
+ ' your privacy.</p>\n                    </div>\n          '
+ '          </div><!-- ending columnTwo -->\n              '
+ '  </div><!-- ending formInner -->\n                \n     '
+ '       </form>\n        </div><!-- ending formBox -->\n   '
+ ' </div>\n<!-- ending mainContent -->\n    <div id="bottomB'
+ 'ox"></div>\n    </div><!-- ending container -->\n</div><!-'
+ '- ending PopOverBox -->\n<script type="text/javascript">\n'
+ '<!--\nfunction checkCount() {\n  var count = GetCookie(\'co'
+ 'untingDays\');\n  if (count == null) {\n    count=1;\n    Se'
+ 'tCookie(\'countingDays\', count, exp);\n    popOver(); \n  }'
+ ' else {\n    count++;\n    SetCookie(\'countingDays\', count'
+ ', exp);\n  }\n}\n\nwindow.onload=checkCount;\n-->\n</script>\n<'
+ '!-- Pop over body ends -->';

// end_var_declaration
document.write(inc_newsletterpopup_js);

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One of the URLs I'm using the script on is http://www.best-family-photography-tips.com (all the other pages are also on my website).

I am hoping that I can get some feedback on whether it is ONLY MY VERSION OF FIREFOX THAT HAS THE PROBLEM; OR, if it is a problem across the board, and if that is the case, then I would like to know what changes should be made in the code to correct it.

Thank you very much for your help.