Well, I invested a little
I tested this out on FF and IE, and on both, the buttons all move when clicked and I can't really tell if they are doing anything. Also, the wording under the buttons is cut off and moves when a button is clicked. With FF, I tried to withdraw on a second account (one I made for testing) and on FF it didn't seem to do anything, and in IE, some line moved and now it shows zero balance. I'll PM you about this with the account info. I forgot which address I entered for withdrawing.
Tried it out with chrome, everything looks like it should. Placed a .01 bet after depositing, seems to work fine on chrome. I may try it out on an iPad later and report back (I dislike iThings so we'll see).
So, in summary;
-It looks like you have a couple CSS issues, for FF and IE at least.
-I didn't see a confirmation of successful withdraw, just zeroed the balance. I think a confirmation would be nice, especially if people are waiting on their deposits to confirm. No biggie though.
Everything looks pretty good otherwise, few smaller suggestions:
a board on one side of the page showing last 20 bets and win/lose would be cool.
I'd like to see what withdraw address I entered, and maybe even be able to change it.