function openwin(url)
  {if (!window.form_cl||form_cl.closed)
   {form_cl=window.open(url,'form_cl','resizable=no,scrollbars=yes,width=600,height=600,left=25,top=25,toolbar=yes');
   }
  else
   {form_cl.close(); 
   form_cl=window.open(url,'form_cl','resizable=no,scrollbars=yes,width=600,height=600,left=25,top=25,toolbar=yes');
   }
}