function NewWindow(mypage, myname, w, h, scroll) 
{
   var winl = (screen.width - w) / 2;
   var wint = (screen.height - h) / 2;
   winprops ='height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable';
   win = window.open(mypage, myname, winprops);
   if (parseInt(navigator.appVersion) >= 4) 
   { 
     win.window.focus(); 
   }
}