FCKEditor doesn't work in IE7, whats wrong

Hi!

I implemented the FCKEditor with followed PHP-Code:

include("editor/fckeditor.php");

$oFCKeditor = new FCKeditor('FCKeditor1') ;
$oFCKeditor->BasePath    = "/editor/" ;
$oFCKeditor->Value        = $row->inhalt;
$oFCKeditor->Create() ;

It works fine with Firefox3, but doesn't work in IE7 (example from the website works fine), what did i wrong?
In IE7 the symbol lists are there, but no textbox :-/

thx for your help!
Dumas