function openWindow(url, w, h, s, m) 
 { 
    var padding; 
    (navigator.appName == "Microsoft Internet Explorer") ? (padding = 10) : (padding = 0); 
	
	var fm;
	
	if(m == null)
		fm = 'no';
	else
		fm = m;	
		
    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="+fm+",locationbar=no,status=yes,resizable=no,toolbar=no,dependent=yes,scrollbars="+s+""); 
    mywin.focus(); 
 }