function show(nname) 

  {
  
   t = (screen.height/2-422-20); l = (self.screen.width/2-500);
   w = screen.availWidth;
   h = screen.availHeight;   
   window.open(nname, '_blank', 'menubar=0,location=0,status=0,scrollbars=1,resizable=o,width='+w+', height='+h+', top=0,left=0');
  
  }