title: getComputedStyle or currentStyle for border-left-width
body: <p>My HTML : <code>&lt;div id="bar" &gt;&lt;/div&gt;</code></p>
  
  <p>My CSS :</p>
  
  <pre><code>#bar
  {
      border-left-width:150px;
  }
  </code></pre>
  
  <p>My JS :</p>
  
  <pre><code>function getStyle(el,styleProp)
  {
      if(el.currentStyle)var y=el.currentStyle[styleProp];
      else if(window.getComputedStyle)var y=document.defaultView.getComputedStyle(el,null).getPropertyValue(styleProp);
      return y;
  }
  
  alert(getStyle(document.getElementById("bar"),"border-left-width"));//Outputs 0px
  </code></pre>
  
  <p>The fiddle : <a href="http://jsfiddle.net/4ABhZ/1" rel="nofollow">http://jsfiddle.net/4ABhZ/1</a></p>
  
  <p>How can I get the <code>border-left-width</code> property? (with my exemple it's not working (on firefox))</p>