Javascript client side validation problem.

Hi all,

Having a bit of a problem with my client side validation. I use 2 different forms depending on the user type. My client side validation works fine for one of the forms but the other is not validating the last two fields.

Here is how I serve up the form:

<form name="contactus" id="contactus" action="<? echo $_SERVER["REQUEST_URI"]; ?>" method="post" enctype="multipart/form-data" onsubmit="return OnSubmit(contactus);">
        <fieldset style=" -moz-border-radius: 8px; border-radius: px;">
        <legend style="font-size:18px; vertical-align:top; color:#FC9200;">Contact this seller</legend>
			<table width= "100%" cellpadding="5px">
             <tr>
             <td style="border-bottom:dotted #CCC 2px">
               <table width="40%" cellspacing="2" cellpadding="0" >
               <tr>
               <td align="left">Title: <br /><?=$rs->SelectSQLWithValue("title", "form", "SELECT title, title, id FROM title WHERE title != '' ORDER BY id", 60, "",$title)?></td>
               <td align="left">First Name: <br /><?=$rs->InputTextWithValue("first_name", "form", 100, 150,$f_name)?></td>	
               <td align="left">Last Name: <br /><?=$rs->InputTextWithValue("last_name", "form", 100, 150,$l_name)?></td>
               <td></td>
               
               </tr>
               <tr >
               <td align="left" colspan="4">Your Email Address:<br /><?=$rs->InputTextWithValue("email", "form", 100, 300,$email)?></td>
               </tr>
               <tr>
               <td align="left" colspan="4">Your Contact Number: <i>(optional)</i><br /><?=$rs->InputTextWithValue("contact_number", "form", 100, 200,$contact_number)?></td>
               </tr>
               <? 
                 $user = $myrow['user_id']; 
                 $sql="SELECT user_id FROM aandc_offices WHERE user_id =".$user;
                 $result = mysql_query($sql);
                 $user_count = mysql_num_rows($result);
                 if($user_count > 0){
                   include("aandc_add.html");
               ?>
               <input type="hidden" value="1" id="extended" name="extended"/> 
               <?
                 } else {
               ?>
               <input type="hidden" value="0" id="extended" name="extended"/>
               <? } ?>
               <tr>
               <td align="left" colspan="4">Country: <br /><?=$rs->SelectSQLWithValue("country", "form", "SELECT id, name, id FROM countries ORDER BY id", 200,"nodefault",$country)?></td>
               </tr>
               <tr>
               <td height="50px" align="left"></td></tr>
               <tr><td colspan="4" align="left"><? echo $alert; ?></td></tr>
               <tr >
               <td align="left" colspan="2" style="padding-left:1px; background-color:#E8E8E8;"><label for="security_code">Enter this security code: </label><br /><input id="security_code" name="security_code" type="text" /></td><td colspan="2" align="left"><img src="/captcha/CaptchaSecurityImages.php?width=100&height=40&characters=5" /></td></tr>
               <tr><td width="15px"></td><td></td><td></td><td></td></tr>
               </table>
             </td>
             <td style="border-left:dotted #CCC 2px; border-bottom:dotted #CCC 2px; padding-top:2px"  class="top">
               <table>
                <tr>
                 <td align="left" width="60%" rowspan="6">Your message: <br /><?=$rs->InputNoteWithValue2("Note", "form", 500, 228, 14, 100,$note)?></td>
                </tr>
               </table>
             </td>
            </tr>
            <tr><td colspan="2" style="color:#999; border-bottom:dotted #CCC 2px">Mysite.co.uk will not share your personal data with any other third party, unless you have given us your express permission to do so. By submitting this form, you confirm that you agree to our <a href="http://www.mysite.co.uk/Terms_and_Conditions.php" rel="nofollow,noindex">Terms &amp; Conditions</a> and <a href="http://www.mysite.co.uk/Privacy_Policy.php" rel="nofollow,noindex">Privacy Policy</a>.</td></tr>
            <tr><td class="input_label" align="center" colspan="2"><?=$rs->ButtonSubmitSendUnsecure("", "input_label")?></td></tr>
            
            </table>

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and this is my validation:

function OnSubmit(f) {


  if(Blank(f.elements['title'], 'Title'))
    return false;
  if(Blank(f.elements['first_name'], 'First Name'))
    return false;
  if(Blank(f.elements['last_name'], 'Last Name'))
    return false;
  if(Blank(f.elements['email'], 'Email'))
    return false;
 
  
  if(f.elements['extended'] = 1) {
    if(Blank(f.elements['address1'], 'Address 1'))
    return false;
    if(Blank(f.elements['city'], 'City/Town'))
    return false;
    if(f.elements['county'].value == "0"){
    alert("This seller requires you to enter a County value before proceeding.");
    return false;
    }
    if(Blank(f.elements['postcode'], 'Postcode/Zip'))
    return false;
   }
  	
  if(Blank(f.elements['security_code'], 'Security Code'))
    return false;
  if(Blank(f.elements['Note'], 'Your Message'))
    return false;

  return true;
  
}

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When the extended form is displayed the validation works but if the normal form is displayed it skips the validation for "security_code" and "Note". So for some reason when "extended" is not = 1 then the two fields below the  that "if" statement block of code is ignored.

Any suggestions?