$url = getenv("REQUEST_URI");
$dest is taken from a mysql database
$goto = "http://" . "$dest" . "$url";
<html><head>
</head>
<frameset rows="100%,*" frameborder="no" border=0><frame name="webmapper" src="<? echo("$goto"); ?>" noresize></frameset>
</html>

This should be enough to get the idea across.  Basically it is a redirection script.  I have 404 errors pointed to this file, so when a person goes to a domain pointed to me that has a REQUEST_URI, that get added to the end of $dest so it takes them to that file in whatever directory they are pointing to.  When i use headers("Location: $dest" . "$url"); it works fine.  In Netscape, it works fine, but in IE it displays a 404 error.  When I changed back to 4.0.1pl2, it worked fine.  What could have changed to make this happen?  Is there anything I can do to prevent this problem?