Attached Link: http://www.renderosity.com/viewed.ez?galleryid=384887&Start=1&Artist=songkann&ByArtist=Yes

Thanx Scott for your comments. No wonder I had some problems when trying to use lights with objects with transparency channel applied on it. I'll try to use your technique on my next project. Here is the WIP I'm working on with the transparency channel. The objects I used are pretty far away from the camera. Two picture of people fighting. Those pictures were mapped onto two planes. I could have used Photoshop to do it, but since I'm trying to learn Carrara, I wanted to do as much work as possible inside Carrara. And I have plans on using this technique on other projects too.