redirect to function when clicking a button

[eluser]echo sara[/eluser]
I have a question, i didnt start my script yet since i'm lost on where to start with this. I want to create a menu and when i click on a tab i want it to go to a function so it can either redirect the page or do a function(run a query).

so for example say the div was the tab how would i redirect it to a different page when its clicked on? and if i wanted it to do a function how would i make that work?

redirecting i can use html <href = direct to function in controller> ; but is that the right method?

<div>
// button
</div>

Any feed back is welcome


Thanks

Sara