There is a much simpler way. Just use this code in your html file:

Code:
<script language="JavaScript" type="text/javascript">
<!--
window.ver4 = false;
if(parseInt(navigator.appVersion) >= 4)
{
window.ver4 = true;
}
function big()
{
if(window.ver4)
{
var str4='bigWindow = window.open("full1.html", "big", "height=' + screen.height + ',width=' + screen.width + ',location=0,menubar=0,scrollbars=1,status=0,toolbar=0,top=0,left=0")';
eval(str4);
} 
else 
{
var str3='window.open("full1.html", "big", "height=480,width=640,titelbar=0,hotkeys=0,dependent=0,directories=0,fullscreen=1,location=0,menubar=0,scrollbars=1,status=0,toolbar=0")';
eval(str3);
}
}
//-->
</script>
Then apply this to a button or mc: getURL("javascript:big();")

(change the full1.html to your url.