function open_popup(url, name)
{
	width= 600;
	height = 580;
	
	if(navigator.appName == "Microsoft Internet Explorer") {
		screenY = window.screen.availHeight;
		screenX = window.screen.availWidth;
	}
	else {
		screenY = window.outerHeight;
		screenX = window.outerWidth;
	}
		
	x = (screenX - width) / 2;
	y = (screenY - height) / 2;
	
	properties = "width=" + width + ",height=" + height + ",left=" + x +  ",top=" + y + ",scrollbars";
	
	window.open(url,name,properties);
	
	return;
}