imagedata, formats

I'm not having much success with jpegs, using jpg as the extension.
gif's show up, but the quality is rubbish.
converted to png in Gimp, the png fails to show at all
(html output, 1.72)

Any suggestions as to what's going wrong please?


regards

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk