Help with as (blur effect)

Does any one know how to blur an image in flash; using actionscript only? (i’m working in flash mx2004; the only way i know to it is with 2 image; one blured and the other not blured). But for a matter of size i have to use on image ( without the blur effect) then use actionscript to make the blur effect on it.
Any one got or knows a script to do that?