How to "lift" the picture off the page.

OK.
I am building a webpage for a photography.
They want a black background.
They want the pictures to have a "shadow" (not sure what you call it) that would essentially make the picture look like it is floating above the page.
I do not know how to do this.
I am open to answers in Photoshop or (although I know this isnt the right Forum) in Dreamweaver.

Thanks.
Yoni

dow the bottom of the layers window is a button with an "F" on it. click that and you can create all sorts of different shadows etc. also for a black background, simply add a layer underneath your other images and use the paint bucket tool to make the whole layer black.