Changing Computer IP

Can someone create a program for me that would enable me to change my computer's IP address? I want to be able to log-in to a website from the same computer, but to show a different IP address each time I log-in to the website. I want the program to allow me to choose different IP addresses each time. I would prefer the program to be in Visual Basic (VB6) if possible. If not, other language will be OK. Please tell me which language you will do the program. Thank You.