Thats a very good point - if the cmos battery is dead then you'll get the same effect as if the reset jumper has been moved i.e. it just doesn't boot.
Usual MB one is a 2032 and should be a few quid and a 2 minutes job to change. If the voltage on it is much below 3.3 then worth changing.
The card on the dealextreme link I posted is very well made for the price and it's worth downloading the manual from the link on the discussion thread at the bottom of the item to se what it show.
Warning - don't go scanning around the DX site as you end up buying loads of odd things
(e.g. disc drive adaptors, phone sim unlockers, LED torches that look like pigs etc.) It's where a lot of Ebay sellers dropship from.