Return Only Template Vars without Generating Image ? (get extents not image )

[Shanton, James A]

Is it possible to do a form submit and return all my template variables
without generating an image ?

I'm working with jbox image swapping but am having a terrible time keeping
up with the proper lat,long coordinate map extents.

I would like to submit an unseen form that returns all the coordinate
extents and template variables so that I can use those in my visible map.

Thanks !

Jim