function centerView(layer, doNotAddOffsets){
	if(typeof layer=="string"){
		layer=document.getElementById(layer);
	};
	
	if(layer){
		var parent=layer.parentNode;
		//parent.style.overflow="auto";
		layer.style.position="absolute";
		layer.style.top=layer.style.top||layer.offsetTop+'px';
		layer.style.left=layer.style.left||layer.offsetLeft+'px';
		var clientH=0, clientW=0, offsetT=0, offsetL=0, top=0, left=0;
		
		if(parent && parent.nodeType==1){	
	
			if(parent.nodeName=="BODY"){
				if(typeof window.innerHeight!="undefined"){
					clientH=window.innerHeight;
					clientW=window.innerWidth;					
				} else if(document.documentElement && document.documentElement.clientHeight){
					clientH=document.documentElement.clientHeight;
					clientW=document.documentElement.clientWidth;
				} else if(document.body.clientHeight){
					clientH=document.body.clientHeight;
					clientW=document.body.clientWidth;					
				} else {
					clientH=parent.clientHeight;
					clientW=parent.clientWidth;					
				};
	
				if(typeof pageYOffset!="undefined"){
					offsetT=pageYOffset;
					offsetL=pageXOffset;
				} else if(document.documentElement && document.documentElement.scrollTop){
					offsetT=document.documentElement.scrollTop;
					offsetL=document.documentElement.scrollLeft;
				} else if(document.body && typeof document.body.scrollTop!="undefined"){
					offsetT=document.body.scrollTop;
					offsetL=document.body.scrollLeft;
				} else {
					offsetT=0; offsetL=0;
				};
				
				top=Math.abs(parent.offsetTop + ((clientH/2) - (layer.offsetHeight/2)));
				left=Math.abs(parent.offsetLeft + ((clientW/2) - (layer.offsetWidth/2)));
			} else {
				clientH=parent.offsetHeight;
				clientW=parent.offsetWidth;
				offsetT=parent.scrollTop;
				offsetL=parent.scrollLeft;
				top=Math.abs(((clientH/2) - (layer.offsetHeight/2)));
				left=Math.abs(((clientW/2) - (layer.offsetWidth/2)));
			};
			
			
		if(!doNotAddOffsets){
			top+=offsetT; left+=offsetL;
		};
		
		layer.style.top=top+'px';
		layer.style.left=left+'px';
		return [top, left, top+'px', left+'px'];
		};
	};

}