Thanks for mentioning that. I did try that already. Problem with that shader is that it produces a shadow on a flat "plane". So if i want to cast shadow of one frog onto another, i will not get natural shadows which follow the "curves" of the frog, but a flat plane shadow, which will be in mid-air.
My main problem is that i need to be able to cast "nicely_follow_the_curves" shadows from one model onto another. Nothing but stencil shadows works that way, and it kills the frame rate too much (nVidia 7600, ...).
Thanks once again!