Site preview in wysiwyg pro

Hello,

I 'm using the wysiwyg pro -editor in Drupal for a site and it works fine. But when you choose the 'preview'-button, it doesn't show your text in the website but on a white background.

On the wysiwig site they give an example, so it has to be possible (I think):

http://www.wysiwygpro.com/index.php?id=341

Unfortunatly I haven't succeeded yet. I 'm pretty new at Drupal so should I use the same method as the exmaple or a totally new one?

Thanks in advance