I must be incredibly dense.

I am trying to put some btc into my MtGox account.  Up until now, I have not used MtGox.  I'm still waiting for a dwolla transfer initiated Friday night to clear.

I am logged in.  I go to the fund accounts page, type in a btc value and click the Send Bitcoins button.  I was expecting to get a btc address to send to.  But it just returned me to the fund accounts page.  As far as I can tell, there is nothing different.  At first I thought, perhaps it somehow manipulates your btc client to send the bitcoins, which was a disturbing thought.  But that is not the case--at least my btc client shows no changes.

I'm certain the correct answer is e-mail MtGox, which I can do, but thought I'd post on the hope that someone can point out my stupidity in missing something obvious.

If it matters, I'm using 32 bit IE 8 on a 64 bit Windows 7 machine.