title: substring javascript not working at all
body: <p>is there any reason why this wouldn't be working? </p>
  
  <pre><code>     var caseString = "sliderInput";
       var theString = caseString.substring(1, 2);
  </code></pre>
  
  <p>I put it through the Firebug debugger in Firefox and it is giving me the error:
  "invalid assignment left-hand side."</p>
  
  <p>*<em>*</em> here is my exact code</p>
  
  <pre><code>        var elements = new Array();
          elements = document.getElementsByTagName("Input");
  
  
  var allSliderInputs = new Array();
  var sliderParams = new Array();
  var first, last, inc, style;
  
  for (var i=0; i &lt; elements.length ; i++){
      var c = elements[i].className; //works fine here
      var t = c.substring(0, 2); //when it hits this line it says "invalid assignment left-hand side"
  
   }
  </code></pre>