Many sites also use cookies to track repeat visitors. You might want to delete all your cookies (or at least the ones for the site in question), in addition to changing your IP.
Also, you may not have to get a new ISP, just to change your IP. If the ISP that you are with assigns IP addresses dynamically (most do, unless you specifically reqested a static IP), then you probably will be able to get a new IP just by rebooting your DSL modem or cable modem. To see what IP you have, go to www.whatismyip.com
Also, you may not have to get a new ISP, just to change your IP. If the ISP that you are with assigns IP addresses dynamically (most do, unless you specifically reqested a static IP), then you probably will be able to get a new IP just by rebooting your DSL modem or cable modem. To see what IP you have, go to www.whatismyip.com