Ok, well not sure its as simple as just having a global to do this (would be too heavy on the server = ))

I'd suggest maybe a new field, and then a script that will do the math, and update the field (so you can set the script to run maybe once a day , or whatever)

If I get some time today, I'll see if I can come up with something. No promises though

Cheers

Andy (mod)
andy@ultranerds.co.uk

---

Want to give me something back for my help? Please see my Amazon Wish List
GLinks ULTRA Package | GLinks ULTRA Package PRO
Links SQL Plugins | Website Design and SEO | UltraNerds | ULTRAGLobals Plugin | Pre-Made Template Sets | FREE GLinks Plugins!