ReplaceTextarea problems in IE

I'm using the JavaScript ReplaceTextArea method, and I'm getting mixed results. I'm posting to a mySQL database. In Firefox on a Mac or PC, everything works fine -- FCKeditor works and data is posted.

PC IE, however, I keep getting an error claiming it can't find the textarea name or id.

Thanks for your help.

Here's a link to the editor:
http://66.118.157.72/editor/

Here's the code:

<script type="text/javascript" src="../fckeditor2/fckeditor.js"></script>
<script type="text/javascript">
window.onload = function()
{
var oFCKeditor = new FCKeditor( 'entry' ) ;
oFCKeditor.ReplaceTextarea() ;
}
</script>

**snip**

<form method="post" name="entry" action="<?php echo $editFormAction; ?>">