Empty content on IE7 !?

I create a editor on my page like:

function EditContent_xhtml($field, $content, $toolbar = 'Default', $height = '400')
{
   require_once('fckeditor/fckeditor.php');
   $oFCKeditor = new FCKeditor($field);
   $oFCKeditor->Height = $height .'px';
   $oFCKeditor->ToolbarSet = $toolbar;
   $oFCKeditor->Value = $content;
   $oFCKeditor->Create() ;
}

The $field variable hold the name of the content area (eg. 'content')
The editor is created, but when I click on save the page, the content is empty. With all other browser it works perfect.
What's wrong with IE?

Thanks,
Feline, CO PortaMx corp.