title: Need to calculate offsetRight in javascript
body: <p>I need to calculate the offsetRight of a DOM object. I already have some rather simple code for getting the offsetLeft, but there is no javascript offsetRight property. If I add the offsetLeft and offsetWidth, will that work? Or is there a better way?</p>
  
  <pre><code>function getOffsetLeft(obj)
  {
      if(obj == null)
          return 0;
      var offsetLeft = 0;
      var tmp = obj;
      while(tmp != null)
      {
          offsetLeft += tmp.offsetLeft;
          tmp = tmp.offsetParent;
      }
      return offsetLeft;
  }
  
  function getOffsetRight(obj)
  {
      if (obj == null)
          return 0;
      var offsetRight = 0;
      var tmp = obj;
      while (tmp != null)
      {
          offsetRight += tmp.offsetLeft + tmp.offsetWidth;
          tmp = tmp.offsetParent;
      }
      return offsetRight;    
  }
  </code></pre>