js alert

[$$$]

  function getParameter (name, ins)
  {
    var query = unescape( window.location.search.substring(1) );
    if (name == null) return query;

    var start = (ins ? query.toLowerCase().indexOf(name.toLowerCase()) : query.indexOf(name));
    if (start > -1) {
      var end = query.indexOf("&", start);
      if (end < 0) end = query.length;

      var res = query.substring (start+name.length, end);
      if (res.charAt(0) == "=") res = res.substring (1);

      return res;
    } else
      return null;
  }

  if ( getParameter("txtFlag") == 0 )
    alert ("txtFlag è ZERO... nella pagina test.asp");