How to re-root

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http://forums.androidcentral.com – Hi all. I rooted my phone a few weeks with Gingerbreak and it went fine. Installed Link2SD and was able to remove bloatware at will. Unfortunately I stupidly uninstalled Superuser because of the update issue with it (to install another Superuser app) no I no longer have root. I know I no longer have root because when I enter "su" at a terminal prompt I get back "permission denied". I've tried re-rooting with Gingerbreak but it goes on and on without rebooting. I've tried manually rebooting the phone and it doesn't help. It's not really a problem because I have the phone the (HowTos)