function sw(url)
   {
     x = 900;
     y = 550;
     cx = screen.width/2 - x/2;
     cy = screen.height/2 - y/2;
     window.open(url,name,"toolbar=no,status=no,directories=no,menubar=no,resizable=no,width="+x+",height="+y+",scrollbars=yes,top="+cy+",left="+cx);
   }