removeChild() not working in IE

Hi, I have some elements which I have added using createElement() from a button event handler. I also have another button so that I can remove the elements which I have added, but although it worked in Firefox and Opera, both IE 6 and 7 won't do it.

HTML:
<div id="container">
<table id="table">
  <tr id="tr1">
    [......]
  </tr>
  <tr id="tr2"><!--This and its children created using createElement()...-->
    [......]
  </tr>
<table>
</div>

JS:
function remove_elem() {
  var elemid = document.getElementById('tr2');
  elemid.parentNode.removeChild(elemid);
}

Many Thanks, Adam.
madscientistAsked:
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