Scrolling Text is smeared and unreadable, why?

[handyandy]

Please view and reply to the comment below...thanks.

[handyandy]

10 views and no replies, I don't think I worded my question right. Allow me to try again.

In this small animation I used a simple motion tween to move some text across the stage. It looks fine in flash, however, when exported as a .gif, the words become a solid blocky smudge. What have I done wrong? I am fairly new to the world of flash, please help.