check if ip is in database otherwise insert ip into database -- 2

Hi, just a simple project here. When users open the website index page there are 3 options to choose. what i need is: When a user clicks on one of these 3 buttons, the website should save the IP into the database including which option they clicked. Next time they return, the homepage should check if its already saved into database. if yes, redirect to that link. In the webpages is a link to go back to the welcome index page. If user clicks that link, it should delete its IP in database and send user to welcome page. [login to view URL] database is already created i just lost the php file. need someone to rewrite the script