Dynamically sizing tab made of images.

Answer 1

I think the Sliding Doors Technique may be what you're looking for.

Answer 2

This is a simplified version that works:

<div style="background: url('BlueTabSprite.png') no-repeat; width: 290px; min-width: 120px; max-width: 290px; height: 23px;">
<div style="float: right; background: url('BlueTabSprite.png') top right no-repeat; width: 10px; height: 23px;"></div>
Test
</div>

Answer 3

This tool may be a help.