Hi *MO*,
Mysterio's given you some pretty good tips, but you can do what you want in about 3 minutes just by using layers (div tags). All you have to do is make 3 layers and put simple hyperlinks on them for those 'sub items'. Set the trigger/action on Item 1,2,3 and you're done (No muss, no fuss!). Use Dreamweaver... it makes working with layers easier than falling off your bike
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Have fun,
E3