function delete_cookie ( cookie_name )
{  //  alert( cookie_name);
//  var cookie_date = new Date ();  // current date & time
// cookie_date.setTime ( cookie_date.getTime() - 1 );
//  document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}
//window.document.writeln("<META HTTP-EQUIV='Cache-Control' CONTENT='no-cache'>");
//window.document.writeln("<META HTTP-EQUIV='Pragma' CONTENT='no-cache'>");
//window.document.writeln("<META HTTP-EQUIV='Expires' CONTENT='0'>");

// delete_cookie (document.cookie);