--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