thanx very much for your reply both of u. well here is what i tried giving effect on colour opacity and what i came up with it was'nt really difficult as i was thinking. after some tries i got the effect well I had a picture in mind about a ufo sending a beam of light,, well here is what i came up with,,, please do tell me how is the effect. thanx once again for helping me out. i will be glad to know what u think about the picture i made(some what fantasy kind of picture it is).