We recently acquired a badly-neglected cactus.

I'm hoping that some cactus lover can help me out by letting me know
what kind of cactus it is. Photo is at the following:

http://www.geocities.com/terrelmay/

Once I find out what kind of cactus it is, I'll search on the Internet
for information on how to care for it. But any hints/tips would be
appreciated.

It's so top-heavy that it doesn't stand up on it's own. In the photo,
the only reason it's upright is because the top part of it is leaning
into the corner. I'm guessing that it should be repotted, but I don't
think just repotting will get it to stand up on it's own. Any ideas
regarding this would be appreciated too.

Thanks,

Terrel
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