function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function setPreloadPage() { //DOM
	var ieNOTopera=document.all&&navigator.userAgent.indexOf("Opera")==-1;
	var dsoctop=document.all? iecompattest().scrollTop : pageYOffset;
	var window_height=ieNOTopera? iecompattest().clientHeight : window.innerHeight;
	var div = document.getElementById('prepage');

	myTop = (window_height - div.clientHeight) / 2 + dsoctop;

	div.style.top = myTop+"px";
	div.style.visibility = 'visible';

//window.alert(window_height);

}