Found it! It's a firefox problem!!, I decided to finally upgrade (and only broke four extensions;-) ) and now it works fine.
good work.
Vijay.
Vijay,
thanks for the feedback. I've had a closer look and managed to tweak the module so it now works on older versions of Firefox also (tried it on Firefox 1.0.7 and Opera 8.51 under Ubuntu Linux).
Mario.
