String.ReplaceAll function in JavaScript

  <script type="text/javascript">
  <!--
     String.prototype.ReplaceAll = function(substr, newstring){
     return this.replace(new RegExp(substr, 'g'),newstring);
    }
    
    //or
    //function ReplaceAll(txt, substr, newstring) {
    //  return txt.replace(new RegExp(substr, 'g'),newstring);
    //}
    
    //test
    function replacecall()
    {
        var name = "I Love Test";
        alert(name);
        alert(name.ReplaceAll(" ","_"));
    }
    replacecall();
  //-->
  </script>

 

    //String to Array
    var txt = eval("Array([1995,12],[1996,22],[1997,36],[1998,37],[1999,45],[2000,50])");
    alert(txt.length);