var mylocation="newsite.htm"
var winheight =100
var winsize =100
var x=5

function go(){
win2=window.open("","","scrollbars=no")
if (!document.layers&&!document.all){
win2.location=mylocation
return
}
win2.resizeTo (100 ,100 )
win2.moveTo(50,25)
go2()
}
function go2(){
if (winheight>=screen.availHeight-55)
x=0
win2.resizeBy(5,x)
winheight+=5
winsize+=5
if (winsize>=screen.width-90){
win2.location=mylocation
winheight =100
winsize =100
x=5
return
}
setTimeout("go2()",10)
}

</script>

This will fit to page regardless of resolution.

To see this in action... http://home.earthlink.net/~crashdjs/jcwebtest2.html