function openWindow(url, w, h) { 
	var padding; 
	(navigator.appName == "Microsoft Internet Explorer") ? (padding = 10) : (padding = 0); 

	var screenw = screen.availWidth; 
	var screenh = screen.availHeight; 
	var winw = (w + 15 + padding); 
	var winh = (h + 15 + padding); 
	var posx = (screenw / 2) - (winw / 2); 
	var posy = (screenh / 2) - (winh / 2); 

	var mywin = window.open(url,"mywin","top="+posy+",left="+posx+",width="+winw+",height="+winh+",menubar=no,locationbar=no,statusbar=no,resizable=no,toolbar=no,dependent=yes,scrollbars=no");
	mywin.focus();
}