Having a little trouble with The uv and mist

Well Basically I put an apha pic of a leef on to a subdivided square mesh, then dotted them all over the floor in the scene. The problem is this. When appling mist to the scene in the world settings the area that is alpha shows as a darkend area around the image. How do I get around this, is there a button that I can press to sort this out or do I have to do something else??? Been trying to sort it for some time now and cannot seem to fix it :confused:
Please could some one help me with this!!!

I have long hair and want to keep it!!:eek:

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without spending a lot of time, i think your mist is showing you a remultiplied alpha problem. where anthying divided by zero is infinity. See the wiki on using the premultiplied alpha button.

Great ‘mist in the lowlands’ picture by the way.