Code:
<ImageStyle Name="exp04_dun_chelsith_epic01_behemoth" displayname="Chamber of Destiny" menugroup="Kunark" zonerect="-244, -172, 245, 152">
<ImageFrame Source="images/maps/map_exp04_dun_chelsith_epic01_behemoth.dds" SourceRect="0,0,839,559" />
</ImageStyle>
not sure we get transparent border right.