CSS tab effect on click

Hey guys,

Here’s a photo of what I’ve got:

[LIST=1]
[]Each of the 5 buttons is in a separate column.
[
]The first button has all CSS borders except the bottom border enabled (looks like a tab) AND a background color (pale yellow)
[]The other buttons have all borders set=0.
[
]The yellow area below the buttons (with the green border) is a separate row with an iframe.
[/LIST]

What I’m trying to do is, when a user presses a button, the button clicked will look tabbed (like the first button now) in addition to opening a new page in the iframe, and all the other buttons will have their background colors and borders negated.

Can anyone help? Let me know if I need to explain it better :hangover:

Thanks in advance,
Matt