Sorting numeric  tags without omitting the attributes
There are a few clear improvements I can see when you are reinserting the nodes back into the DOM tree. 

for (i=0; i&lt;nEntryArray.length; i++)
{
  nList.appendChild(nEntryArray[i]);
}


1)  You may benefit from using a documentFragment to build up your elements then submit them all at once to the nList

2)  (micro), cache the length of your array in the for loop.  

var df = document.createDocumentFragment();
for( var i = 0, l = nEntryArray.length; i &lt; l; i++) {
    df.appendChild(nEntryArray[i]);
}
nList.appendChild(df);


Otherwise I do not see any issues with this code. http://jsfiddle.net/rlemon/faY3Z/