function Center(url) {
	day = new Date();
	id = day.getTime();

	if (window.opera) {
		var xMax = window.outerWidth, yMax = window.outerHeight;
		alert(xMax);
	}
	else if (document.all || document.getElementById) {
		var xMax = screen.width, yMax = screen.height;
	}
	else if (document.layers)	var xMax = window.outerWidth, yMax = window.outerHeight;
		else					var xMax = 640, yMax=480;


	var xOffset = (xMax - 820)/2, yOffset = (yMax - 684 - 20)/2;

	eval("page" + id + " = window.open(url, '" + id + "','toolbar=0,scrollbars=0,location=0,statusbar=1,menubar=0,resizable=0,width=820,height=684,screenX=" + xOffset + ",screenY=" + yOffset + ",top=" + yOffset + ",left=" + xOffset + "');");
};