function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

 function openWindow(url, w, h) 
 { 
    var padding; 
    (navigator.appName == "Microsoft Internet Explorer") ? (padding = 5) : (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=yes"); 
    mywin.focus(); 
 }