Punto de mira que ocupa toda la pantalla (color verde)
<div id="leftright" style="width:e-xpression(document.body.clientWidth-2)"></div><div
id="topdown" style="height:e-xpression(document.body.clientHeight-2)"></div>
<script language="JavaScript1.2">
<!--
if (document.all&&!window.print){
leftright.style.width=document.body.clientWidth-2
topdown.style.height=document.body.clientHeight-2
}
else if (document.layers){
document.leftright.clip.width=window.innerWidth
document.leftright.clip.height=1
document.topdown.clip.width=1
document.topdown.clip.height=window.innerHeight
}
function followmouse1(){
//move cross engine for IE 4+
leftright.style.pixelTop=document.body.scrollTop+event.clientY+1
topdown.style.pixelTop=document.body.scrollTop
if (event.clientX<document.body.clientWidth-2)
topdown.style.pixelLeft=document.body.scrollLeft+event.clientX+1
else
topdown.style.pixelLeft=document.body.clientWidth-2
}
function followmouse2(e){
//move cross engine for NS 4+
document.leftright.top=e.y+1
document.topdown.top=pageYOffset
document.topdown.left=e.x+1
}
if (document.all)
document.onmousemove=followmouse1
else if (document.layers){
window.captureEvents(Event.MOUSEMOVE)
window.onmousemove=followmouse2
}
function regenerate(){
window.location.reload()
}
function regenerate2(){
setTimeout("window.onresize=regenerate",400)
}
if ((document.all&&!window.print)||document.layers)
//if the user is using IE 4 or NS 4, both NOT IE 5+
window.onload=regenerate2
//-->
</script>
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