<script type="text/javascript">
function sendthistothat(address){frame2.document.location=address+'/userID';}
</script>
</head>
<frameset rows="300px,350px">
<frame src="http://www.ursite.com" onload="sendthistothat(this.src)" />
<frame name="frame2" src="">
</frameset>
On this example it will load the same url on the second frame but with a little variation, it will add a username, of course this will only work if you have configured your site to work with something like this. But at least I hope this helps.