Hilt, Twisted_Symmetry, and arfarfarf, thank you for your response.

No, I did not use xVid or DivX.

Not a -poser one!
But, It was working with Premiere 6.

arfarfarf, thank you for your detailed instructions. I am going to try them.
I had one question which came into my mind. I am using lip synchronization voice of Mimic. How can we handle the synchronization voice when we use tiff image sequences?

Thank you again.
HimiCo.