Question

I have this:

<input type="hidden" id="aid" value="<? echo $_GET['id']; ?>"></div>

and

  var aID = document.getElementById('aid');
  var postFile = 'showcomments.php?id='+ aID.value;
  $.post(postFile, function(data){

Why will this only work in FF and not IE?

Answer 1

IE has issues (bugs) with keeping namespaces distinct. Do you have anything else on the page that uses “aid” as an id, a name, a variable at global scope, …? If so, that’s your problem. An easy way to check is to do an experiment: Change the hidden field’s ID to flibberdegibbet and change the string in your getElementById call. If it starts working, that means you have a name conflict somewhere.