[jQuery] stop hover

hi,
well i got a little problem.
i got some images which get a border if i hover over it. if i click an
image it gets big and in front of the others but it still gets a
border if i hover over it. that sucks and i don't know how to stop it.
i didn't programmed this hover so i don't know something about it
except it does a border!
i'll be happy about every idea. thanks for reading.
-weidc