Include Dynamic Stylesheet File

I have just installed FCK Editor. It works. But there is one Problem:

The CSS-file I want to include is generated dynamicly by a php script. FCK ignores this. It uses the unparsed File. Is there a possibility to use the dynamic css file.

i included the file with:

oFCKeditor.Config[ 'EditorAreaCSS' ] = 'css.php?...' ;