function positionTable() {
		var d = document.getElementById("mainDiv");
		var sw = (window.innerWidth) ? window.innerWidth : document.body.offsetWidth;

		var dl = ((sw/2) - (d.offsetWidth / 2));
		d.style.left = dl + "px";
		return;
	}
	
	window.onload = function() {
		positionTable();
	}
	
	window.onresize = function() {
		positionTable();
	}
	
	function openPopup(url, width, height) {
		window.open(url,"", "toolbars=no,location=no,scrollbars=no,width="+width+",height="+height);
	}