please somebody help me, ive been trying all morning and cant seem to do this.

What i need to do is have some buttons on my page and when you go over them the text below changes. Also i need small pictures and when rollover they expand, do anybody know how to do either of these, its a little like this on ebay,

http://cgi.ebay.co.uk/PETER-WERTH-MENS-BROWN-WAX-LEATHER-SHOES-SIZE-9-43_W0QQitemZ280154249530QQihZ018QQcategoryZ1262QQtcZphotoQQcmdZViewItem

thanks in advance to anyone who can help me, i dont have much hair left now