Ok, I called in one of the programming guru's at work, and in trying to explain it to him, I hit apon the solution.
The solution that I've discovered is a combination of Javascript and SSI includes.
Code:
<noscript><meta http-equiv="refresh" content="2; URL=indexresnet.html"></noscript>
<script language="JavaScript">
<!--
var resnetsTargetURL = "https://netreg.bridgew.edu/indexresnet.html";
var allsTargetURL = "https://netreg.bridgew.edu/indexall.html";
function doRedirect()
{
var ip = "REMOTE_ADDR";
if (ip.indexOf("192.168") >= -1)
setTimeout( "window.location.href = resnetsTargetURL", 2*1000 );
else
setTimeout( "window.location.href = allsTargetURL", 2*1000 );
}
//-->
</script>
<script language="JavaScript1.1">
<!--
function doRedirect()
{
var ip = "REMOTE_ADDR";
if (ip.indexOf("192.168") >= -1)
window.location.replace( resnetsTargetURL );
else
window.location.replace( allsTargetURL );
}
doRedirect();
//-->
</script>
of course the <body onload="doRedirect()"> tag is in there too.
Thanks for all your suggestions, you guys at least got me started on the right road.