split() in JavaScript

<script language="JavaScript1.2">
    <!--
    function genResults(arrayName, testName){
      document.write('<b>Currently Evaluating: ' + testName + '</b><hr>');
      if(arrayName == null){
        document.write('No matches were found');
      }else{
        for(var i = 0; i < arrayName.length; i++){
          document.write('[' + i + ']: ' + arrayName[i] + '<br>');
        }
      }
      document.write('<P>');
    }

    var myString = new String("This is a test");
    var myRegExp = /\s/g;
    var mySeparator = " ";

    genResults(myString.split(mySeparator), "Separator Only");
    document.close();
    -->
    </script>