I, for one, would advise against the use of that type of fogger. They're rather prone to heating up the water, and have a nasty tendency to fry the diaphragm motor after a while. Personally, I've had much success with the cheap personal humidifiers that you can purchase at nearly any local general store. I think I came upon mine at Wal-Mart :spy: You should be able to find some step-by-step guides on the web.
In brief, it costs less, keeps equipment out of the aquarium, and works much more reliably.
Just thought I would add that I've picked up several "cold-fogging" humidifiers at local thrift stores (like salvation army), for super-cheap ($1-3). They work really well for this type of application on a low setting with a timer.
i agree with everyone on that the fogger will heat up the water, but what i did is put it on a timer. because of the timer it gives a chance for the water to cool down, and this will prolong the diaphragm. i know it sounds odd but i have built many paludariums and i have only had one of my tanks where the tank needed a new fogger, but that was after 2 years. the times where. 15min-on 2hr-off. 15on-3hr-off. 15on 2hr off. 15on 5hr off.