--ok first thing to do is make a new document any size then color the backround any color (i choose white)
then put your text in.
--now go layer>new then name it Gradient now take the gradient tool and make a mark like so
--Now press Ctrl+I then set the blend mode to lighten
--then press this button
--Now when you in imageready go to the top and press Window>Animation
--Now press the little button in the top right corner and select new frame
--now take your gradient layer and press Shift and Drag the gradient layer from where it was to where you want it to go.
--then click the tween button and use these settings
--Now your thing should turn out like this