Here is a tiered CSS drop-down menu that works in IE 6, 7, and 8; Opera 9 and 10; Firefox 3.5.3.00; Flock 2.0 and 2.52; and Chrome 2.0.172.43 and 3.0.195.21 without hacks or javascripting and is accessible without using a mouse.  One downside is that it still uses images for the tabs and the sub-menus are only one level.

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