category selection help

Hello everybody,I'm new but making progress in learning php...to learn php i wrote my own classified program but need somehelp with the way the category behaves. i like it to be able to select the category using the mouse and have it run a php code or a function based on the click and maybe have it change color when the mouse moves over it..this is what i have soo far: http://www.comgen.ca/phptest/mainclas.php.
any help you can give me would be greatly appreciated.. maybe a sample code to start me of/
thanks everybody

Those type of things are done on the client side, ie JavaScript.
To execute some PHP code when the user clicks on an object ... use the onClick() to call your script.
To have it change colors when the user mouse over the link you can a) use javascript onMouseOver() and onMouseOut() or b) use css hover.
That get you going in the right direction.

you mean "To execute javascript code..", not "To execute PHP code..", right?

Yeah, it is sort of vague.

Use the objects onCLick() to execute your javascript code that calls you php code.

How was that?

hehe, close.. more descriptively :

Assign the property of the html object, onClick to a javascript function - ie. <img src=blah.gif onClick='window.location("test.php");'> to force the browser to go to the page containing the server side php code..

But your explanation is probably clearer ;)