Strange margin around CFTEXTAREA

Hello,

I was trying the richtext editor with CFTEXTAREA. Locally everything works perfect, but when I try it online on a dutch provider (www.webstekker.nl) I get a strange problem:

There is a margin visible around the editor. To make it extra visible I put a red backgroundcolor color around it, and you see that there is a margin in the Iframe of the editor. when I load the testpage in Firefox, it is even worse. There the entire background is shining thru the editor. Locally, I have no problem with a standard installation.

It looks like every script is accessable in the CFIDE folder, so I'm really puzzled. Does anyone have an idea?

example: http://www.beau-anne.nl/test.cfm

Src:
<!--- ---------------------------- --->

<SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">
<!--
function FCKeditor_OnComplete(editorInstance)
{
editorInstance.Config["ToolbarSets"]["BasicMin"] = [
['Bold','Italic','Underline'],
['OrderedList','UnorderedList'],
['TextColor','BGColor']
];

editorInstance.EditorWindow.parent.FCK.ToolbarSet.Load('BasicMin' ) ;
}
//-->
</SCRIPT>

<table>
<tr>
<td style="background-color:red;">
<cfform method="POST" action="" name="testform">
<cftextarea name="content" richtext="true" toolbar="Basic" width="500"></cftextarea>
</cfform>
</td>
</tr>
</table>
<!--- ---------------------------- --->