Shadows?

Is there a way to make a realtime shadows with shaders. Or if it is done some other way please point me into the right direction, Thanx

ps. I don't mean on those ugly shadows that come with dropshadow(); function i know that already.

try my.shadow = on; and read about settings like:
d3d_shadowdepth, shadow_threshold, shadow_offset, shadow_range... etc