onlick na buttone a nedefinovana funkcia

<input type="button" value="odeslat" onClick="upozorneni();">

<script language="javascript" type="text/javascript">



    function processRequest()

    {

      if (httpRequest.readyState == 4)

      {

        if(httpRequest.status == 200)

        {

          var mistoZobrazeni = document.getElementById("mistoZobrazeni");

          mistoZobrazeni.innerHTML = httpRequest.responseText;

        }

        else

        {

            alert("Chyba pri nacitani stanky

    "+ httpRequest.status +":"+ httpRequest.statusText);

        }

      }

      alert("jedna");

    };		

		

  function vyberClanek()

  {

         

       var meno = document.getElementById("vyber").value;

        var url = "spracuj.php?zaznamistavov="+meno;

          if (window.ActiveXObject)

          {

            httpRequest = new ActiveXObject("Microsoft.XMLHTTP");

          }

          else

          {

            httpRequest = new XMLHttpRequest();

          }

          httpRequest.open("GET", url, true);

          httpRequest.onreadystatechange= function () {processRequest(); } ;

          httpRequest.send(null);

          alert("dva");

       

  };

</script>

</head>

<input type="button" value="odeslat" onClick="vyberClanek();">