Where is this gap coming from?

Head out to http://www.hihatwebdesign.com/Trinity/header.php

There's this large gap from the top of the screen to the top of the header graphic and I don't see where it's coming from.

Here's a screenshot of the way it looks on my box:

screenshot
Compare that to the way it shows up on Safari and IE:

good screen
I've got no idea why there's a discrepancy between what I'm working on and what's being rendered in the "live" environment.

Here's my stylesheet:

body {
	font-family: Helvetica, Microsoft Sans Serif;
	font-size: 14px;
	color: #000000;
	vertical-align: top;
	padding: 0px;
	height: 100%;
	width: 100%;
	margin: 0;
	background-color:#202740;
}

#body_tray {
position:relative;
width:997px;
height:800px;
margin:auto;
padding:25px;
}

#header {
position:relative;
margin:auto;
height:236px;
width:997px;
background-image:url(images/header.png);
background-repeat:none;
z-index:-1;
}

#search_box {
position:relative;
z-index:2;
margin-left:820px;
margin-top:175px;
}

#nav_bar {
position:relative;
margin:auto;
width:997px;
height:38px;
background-image:url(images/nav_bar.png);
background-repeat:no-repeat;
}

#navcontainer ul {
margin-top: 5px;
padding: 0;
list-style-type: none;
}

#navcontainer ul ul {
display: none;
margin-left: 0;
padding: 0;
width: 200px;
position: absolute;
top: 33px;
background: #ffffff;
z-index:10;
border-style:solid;
border-width: thin;
border-color:#cccccc;
}

#navcontainer ul li:hover > ul 
{
display: block;
}

#navcontainer ul li { 
display: block;
float:left; 
}

#navcontainer ul li a
{
font-family: Arial Narrow, Microsoft Sans Serif, Helvetica;
font-size: 18px;
color:#493417;
font-weight:bold;
text-decoration: none;
padding-left:45px;
padding-right:40px;
display:block;
}

#navcontainer ul li a:hover
{
color: #4b7235;
}

#navcontainer ul ul li a {
font-family: Arial Narrow, Microsoft Sans Serif, Helvetica;
font-size: 16px;
color:#493417;
padding-left:5px;
}

#navcontainter:after {
	content: ".";
	display: block;
	clear: both;
	visibility: hidden;
	line-height: 0;
	height: 0;
}



#body_block {
position:relative;
width:997px;
height:485px;
background-image:url(images/body_block.png);
background-repeat:none;
z-index:-2;
}

#body_text {
position:absolute;
width:704px;
height:482px;
margin-left:267px;
margin-top:5px;
background-color:#cccccc;
}

#left_column {
position:absolute;
width:230px;
height:503px;
margin-left:25px;
margin-top:5px;
}

#cursor {
position:absolute;
width:13px;
height:25px;
background-image:url(images/cursor.png);
background-repeat:none;
margin-top:150px;
margin-left:125px;
z-index:2;
}

#left_nav {
display:inline-block;
position:absolute;
width:230px;
height:329px;
margin-left:25px;
margin-top:180px;
background-image:url(images/left_column_background.png);
background-repeat:none;
}


#footer {
position:relative;
height:26px;
width:997px;
margin:auto;
}

input.login_box{
   border:0px;
  width:109px;
  height:21px;
  font-size: 10px;
  color: #cccccc;
  display: inline;
}

a.staff {
margin-top:0px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_church_light.png);
background-repeat:no-repeat;
}

a.staff:hover {
margin-top:0px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_church_dark.png);
background-repeat:no-repeat;
}

a.directions {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_directions_light.png);
background-repeat:no-repeat;
}

a.directions:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_directions_dark.png);
background-repeat:no-repeat;
}

a.times {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_times_light.png);
background-repeat:no-repeat;
}

a.times:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_times_dark.png);
background-repeat:no-repeat;
}

a.directory {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_directory_light.png);
background-repeat:no-repeat;
}

a.directory:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_directory_dark.png);
background-repeat:no-repeat;
}

a.gallery {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_gallery_light.png);
background-repeat:no-repeat;
}

a.gallery:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_gallery_dark.png);
background-repeat:no-repeat;
}

a.pastor {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_pastor_light.png);
background-repeat:no-repeat;
}

a.pastor:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_pastor_dark.png);
background-repeat:no-repeat;
}

a.gallery {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_gallery_light.png);
background-repeat:no-repeat;
}

a.gallery:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_gallery_dark.png);
background-repeat:no-repeat;
}


a.campus {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_campus_light.png);
background-repeat:no-repeat;
}

a.campus:hover {
margin-top:1px;
display:inline-block; /**** important ****/
width:230px;
height:43px;
background-image:url(images/link_campus_dark.png);
background-repeat:no-repeat;
}

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Thanks!
brucegustPHP DeveloperAsked:
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Chris StanyonWebDevCommented:
Your #search_box has a top margin of 175px which pushes everything down (line 38 of stylesheet.css). Remove that and you'll remove the gap.
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brucegustPHP DeveloperAuthor Commented:
Got it, Chris!

I also changed position:relative to position:absolute and that seemed to make a difference. Not sure why, but I'm still learning.

Thanks!
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Chris StanyonWebDevCommented:
As soon as you change the postion from relative to absolute, the element is taken out of the flow, similar to how floats work, which is why it no longer pushes everything away from the top.

CSS has a few little quirks, but keep at it - soon enough the penny will drop and it'll all make sense
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