[Xymon] Looking for "page too old" script

I have a tsch script that does some things, manipulates and image and such and posts it on a web site. Occasionally, I have found a bug or two where the image stops updating. I don't know this until it is too late. Is there any sort of technique or custom script that will poll a website and see if something is to old? I'm at a bit of a loss as to how to correctly indicate a problem and hoping there is something I can start from already.

Thanks in advance!

Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373