Simple asp.net / FCKeditor / javascript question ...

... or at least I think it is!

All I want to be able to do is, using Javascript, take the HTML contents of FCKeditor and put them in to a textarea.

At the moment the relevant code is:

<script type="text/javascript">
function copyHtml(from,to) {
to.value = from.value;
}
</script>

....

<FCKeditorV2:FCKeditor id="inputbox" BasePath="~/FCKeditor/" runat="server" />

<textarea id="htmlbox" onfocus="javascript:copyHtml(this.form.inputbox,this.form.htmlbox);" rows=10 cols=30></textarea>

Should be simple ... but my brain's fried! Help!
Problem's in the Javascript - I can get the "to.value", just not "from.value"