transparency problem

heyya. im using photoshop with another program. this program doesnt accept alpha values, instead you set a transparency colour
(and all pixels of the same colour are assumed to be transparent)

my problem is that photoshop tends to leave a pixel or 2 thick set of semi transparent pixels around whatever im drawing >.< these pixels in my second program are generally thaught of as being white, which screws up alot of projects.

i was just wondering, how could i solve my problem (im not a photoshop expert) but maybe theres a delete semi transparent pixels button (would be ideal) or can you turn off the way that it does this?

i appologise if this isnt explained too well
thanks anyway D.R =]

I'm not sure whether you had the same problem as I had a while back, but I found a solution to my problem in the following tutorial:

http://www.wise-women.org/tutorials/ps1/