algorithm for alphabetical insert - special case
<p>I was getting an error of d.tagName is undefined in the code below.  This would happen when I inserted a new element into a list in alphabetical order and it was greater then the last element in the list.  In this case it should be inserted at the end of the list.  e and b are the elements to be inserted and d is the element they are to be inserted before in order to maintain alphabetical order.  It works fine except for the case I mentioned where the elements are the last in the list.</p>

<pre><code>  while(d=d.nextSibling) 
    {
    if(d.tagName=="undefined")
      {
      a.insertBefore(e,d);
      a.insertBefore(b,d);
      break;
      }
    else if(d.tagName.toLowerCase()==="a" &amp;&amp; (b.innerHTML&lt;d.innerHTML))
      {    
      d=d.previousSibling;
      a.insertBefore(e,d);
      a.insertBefore(b,d);
      break;
      }
    }
    return 1;
</code></pre>
