function popup(url){
		var winChild;

		var maxScreenWidth = screen.width;
		var maxScreenHeight = screen.height;		

		if (maxScreenHeight == undefined) {
			winChild = window.open(url, '_outline', 'toolbar=no, directories=no, menubar=no, resizable=yes, scrollbars=yes, width=620, height=540, top=100, left=150');
		}
		else {
			if (maxScreenHeight > 100) {
				var leftPosition = Math.round((maxScreenWidth - 750) / 2);
				var topPosition = Math.round((maxScreenHeight - 550) / 2);
				winChild = window.open(url, '_outline', 'toolbar=no, directories=no, menubar=no,resizable=yes,scrollbars=yes,width=620,height=540,top=' + topPosition + ',left=' + leftPosition);
			}
			else {
				winChild = window.open(url, '_outline', 'toolbar=no, directories=no, menubar=no, resizable=yes, scrollbars=yes, width=620, height=540, top=200, left=250');
			}
		}
	}