ok, first u made the base of ur button, with ur text on a seperate layer (very important!!)
Now place ur text so that the leading edge of ur text (just barely showing the first letter) is at the right edge of ur button...
then, on the animation menu, click 'add frame' and duplicate the frame.
In ur second frame, move the text so that the last letter can just been seen off the left edge.. making sure that they're perfectly aligned horizontally,
hilite both frames by clicking them while holding down the shift button, then click the tween button
http://www.dslreports.com/r0/download/2472...TweenButton.jpgfor a smooth effect, add at least 10 frames