window.onload = window.onresize = function(){
	scrSizeX=document.documentElement.offsetWidth;
	scrSizeY=document.documentElement.offsetHeight;
	theSizeX=document.getElementById("wrapper").offsetWidth;
	theSizeY=document.getElementById("wrapper").offsetHeight;
	
	setValX=Math.round(((scrSizeX-theSizeX)/2))+"px";
	setValY=Math.round(((scrSizeY-theSizeY)/2))+"px";
	
	document.getElementById("wrapper").style.left=setValX;
	document.getElementById("wrapper").style.top=setValY;
}