Wowie. i got this contribution working now!
Then i saw another one: ImageHandler 2! Functions look great and look fine!!! :)

BUT..i could not find a doc or readme to do some manual changing in html_output.php.... for that is as far as i can see the only crucial core file that comes from the Imagehandler contri and then one of the 2 contri's do not work anymore.

Is there a manual how to do a merging of the SEF url & Image handler in html_output.php?