Is there a way to include the gxt-all.css in the module xml file?

When I try:
<stylesheet src="css/gxt-all.css"/>
it won't find it because it is looking in the generate js directory. I tried:
<stylesheet src="../css/gxt-all.css"/>
but no luck. It just stripped out the "../" part.

I'd rather load gxt-all.css on demand rather than include it in a JSP files where sometimes GXT is required, sometime it is not...

Any way to do it right in the module file without having to copy these .css there, I don't like that solution either...