Ok, this smacks of insanity to me!
First and foremost, what problem are you having displaying the JPG files? I'm betting that there has to be a solution other than converting them all to BMP files.
As a closely related issue, converting from JPG to BMP will increase your file size more than ten times, possibly more than a hundred times. This means more disk space, and more importantly lots more network traffic. This has the potential to ruin your network performance.
I'd look long and hard for another solution before I bit into this one!
-PatP