Using Pix on an ospf environment

Hello

I have a network based on rings and routers. Dynamic routing is perfomed by OSPF . I have installed a pix on a central site.

Supposed two PC's in different sites, i'd like to use the pix it rather than allowing direc routing.... is it possible? I've been thinking in it for hours but OSPF makes its job...

(PCa-10.0.0.1) (PCb-11.0.0.1) | | (Router) ---------(Router) --------- (Router) ------ (Router) | | | | (Router) ----XX--(Router) --------- (Router) ------ (Router) | | (Pix)

Routers using 192.168.0.0 /16

PCa would use PIX to get to PCb with any logical topology

Thanks in advance