what that links to is a custom 404 -page is that what you are trying to do ?
--------------- Added 10 Mar 2011 at 10:12 ---------------
what you want is to make a custom template its so easy, just goto styles and templates/stylemanager/add new template
when you create the template you just name it custom_whatever the whatever is what will be used to call the page with a link like this http://yourwebsite.com/misc.php?do=page&template=whateveryou will add this code for header and footer <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="{vb:stylevar textdirection}" lang="{vb:stylevar languagecode}" id="vbulletin_html">
<head>
{vb:raw headinclude}
<title>Four States Photo Studio</title>
<link rel="stylesheet" type="text/css" href="{vb:var vbcsspath}vbulletin-formcontrols.css" />
</head>
<body>
{vb:raw header}
{vb:raw navbar}
<div class="blockbody">
<div class="blockrow">
<center>
<table width="800" border="0">
<tr>
Your content html or whatever will go into this area of the template
</tr>
</table>
</center>
</body>
</div>
</div>
{vb:raw footer}
</body>
</html>