[GNC] About stylesheets

[John Walker]

I have a few questions concerning invoicing:
I believe the only header images that are appropriate for stylesheets 
are 100dpi png formats up to 15cm wide.  Is this correct?  I experienced 
quite a few adventures working this out. Is there a better method 
available for working with images in stylesheets besides trial and error?

I was able to make up a custom stylesheet and get a satisfactory invoice 
template.  However, it did not save when I shut down Gnucash.  What am I 
doing wrong?

Is there any documentation concerning the CSS-based stylesheet 
(experimental)?  Is this an area a mug punter like myself should be 
playing with?

Cheers
John