Designing an all purpose web navigation header

Create a rounded rectangle using rounded rectangle shape tool.

Ctrl+Click to get the selection. Contract the selection by 2 pixels. Create a new layer. Apply Black to white gradient.

Change layer mode to "Hard Light" and opacity to 50% for this layer.

Duplicate the layer. Move it a few pixels upwards. Change the layer mode to "Screen" from the layer palette.

Similarly create more buttons.