Auto wifi enabler/disabler

[RonDutt]

Is there some app that turns wifi on every X minutes, checks to see if any AP's that it's connected to before are around and either a) connects to that ap or b) if no AP's are found, disables wifi and waits until another X minutes pass. Reason I want an app like this is I work at a datacenter a few floors below ground level, near my desk I get a few bars of EVDO/3G (go Verizon!), but elsewhere in the datacenter I'm barely getting by on 1 or 2 bars of 1X, which disables Microsoft Push for emails. Emails are *highly* important for me (alerts and such come through email) and I would rather not lose that ability when I lose my data signal. The entire basement is covered from top to bottom with wifi though, same with my workshop at home (basement, but covered with wifi). Battery isn't much of an issue since I plug in anywhere I see a USB port.