Are you not listening to me? :-)
It's totally useless to put it in your Ram Disk.
If you don't want to use swapping while decoding JPEGs, simply turn the memory limit off in IBrowse's settings.
Putting it in Ram: would be similar to using a Ram Disk as your swap partition in Linux. It might work, but what's the point? If you don't like the disk access, turn the swapping of instead :-)
There's a reason why they call it _virtual_ memory, y'know...