[Javascript] éléments séléctionnés

<html>
  <head>
    <script language="javascript" type="text/javascript">
      function formsubmit(){
	options = document.formulaire.liste.options;
	selectedValues = new Array();
        for(i=0 ; i<options.length ; i++){
	  if(options[i].selected){
	    selectedValues[selectedValues.length]=options[i].value;
            alert(options[i].value+" is selected");
          }
        }
	formAction  = "https://www.google.be/webhp?hl=fr&gws_rd=ssl";
	for(i= 0 ; i<selectedValues.length ; i++){
	  if(i>0) formAction += "+";
	  formAction += selectedValues[i]; 
	}
	formAction += "&meta=";
alert(formAction);
        document.formulaire.action=formAction;
        return true;
      }
    </script>
  </head>

  <body>
    <form name="formulaire" id="formulaire" action="" method="POST">
      <select name="liste" id="list" multiple>
        <option value="CCM">CCM</option>
        <option value="HackTrack">HackTrack</option>
        <option value="javascript">javascript</option>
        <option value="java">java</option>
      </select>
<br/>
<input type="submit" onclick="return formsubmit();"/>
    </form>
  </body>
</html>