Hi Maileen, welcome to the community. [honesty]
That effect is much simpler than you think. Being as you're a new user though, you may have to do a bit more work to understand some thing explained in any tute you try at this stage.
That's ok though, the members here are eager to help should you get stuck on anything. Just be sire to explain your situation with as much detail as you can.
Here's a tute that will start you off toward your desired effect:
http://www.photoshopgurus.info/forum...pic.php?t=3469
It's fully adaptable to a rounded rectangle shape instead it's own.
And another tute on glass effect, using a 'button' as the example shape:
http://photoshopgurus.info/intermedi..._buttons.shtml
Good luck. [righton]