I don't know javascript. Is it complete enough of a language to do the hex to decimal conversion and text formatting? If so, then it sounds like a good plan. It'd be much more user friendly if you could just have a local .js file do the conversion and display rather than needed another prog running on the empeg.

If anyone wants to do it in JS (or anything else), here's my C source for the above prog. Feel free to copy any code that would be useful.