function popup(strURL)
     {
      objWindow = window.open(
                       strURL,
                       'wmdPOP',
                       'height=600, width=800, scrollbars=yes, toolbar=no, statusbar=no, locationbar=no, top=' + ((screen.height / 2) - 300) + ', left='  + ((screen.width / 2) - 400)
                       );

      if(objWindow.focus)
       {
        objWindow.focus();
       }
     }