function openwindow(url, name, width, height, scrollb)
	{
		var str = "width=" + width + ",innerWidth=" + width;

		str += ",height=" + height + ",innerHeight=" + height;
		str += ",scrollbars=" + scrollb + ", resizable=0";
		
		if (window.screen)
		{
		var ah = screen.availHeight - 30;
		var aw = screen.availWidth - 10;
		var xc = (aw - width) / 2;
		var yc = (ah - height) / 2;

		str += ",left=" + xc + ",screenX=" + xc;
		str += ",top=" + yc + ",screenY=" + yc;
		}

	window.open(url, name, str); 
	}