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Well to get out of this. IF YOU ARE RUNNING NETSCAPE pres ALT-F4 repeatedly and it will close the windows of Death.
If you are RUNNING the evil Internet Explorer, use Ctrl-ALT-DELETE (you have to be fast) and kill Explorer (not interent Explorer).
Either way, you may lose data unless your broser crashes by itself, please don't press things you are told not to.
If you aren't running JavaScript or have an old computer or browser, all is probably happy and well, you're safe.