Need help with image

[Alidad]

Hi, I'm rookie guy and i'm continue learning php and mysql, i want to create something for myself to learn something for myself.

 

Please check www.ask.com where you see image background with text field in forground, i'm trying to develop of how to change image of background from menu.

 

let say that when load page is show background image of (currently.jpg) and i have four images names under menu for person to select, that list of menu are (first-image.jpg, second-image.jpg, 3rd-image.jpg and fourth-image.jpg).

 

My question is how can i write code if person select second-image.jpg from the menu, and then automatic change image background just like ask.com!

 

this part is i can't figuer out how to do that!

 

please help thanks.

 

AM