Photoshop :: Creating A Gleam Inside Of Letters

I've always been stumped with how to do this so thought I'd post it here.  I've typed up some text and then rasterized it.  Then I created a blank layer above it, highlighted the text below, then made the blank layer active and painted a shiny gleam over on the layer.  See below: 
 
However, when I move the gleam layer, it doesn't just float over and within the letters below it.  I obviously know why and that's because the gleam layer is above the text layer:
 
So basically what I want to be able to do is when move that gleam layer, I want the gleam to float over the logo but stay within the letters so it looks like the logo has a shine over it.  If I knew how to do this, I could create animated GIFs and even export the files into Premiere or whatever.
 
Tell me the best way to do this in PSD CS4?