special proxying

Hi

I have a problem I need to solve, but I dont know if it is possible
using mod_proxy:

I'd like to create an elearning web portal which will group and mediate
other elearning resources and portals all over the internet I'll coose.
But all the requests for resources on the other portals have to be
mediated (proxied) by my portal for logging and accounting capabilities.
The problem is, that the "proxy" must in this case rewrite all the URLs
on webpages (I belive).

For example: resource#1 (some webpage) is on OTHERPORTAL server

CLIENT->MYPORTAL: REQUEST for resource#1
MYPORTAL->OTHERPORTAL: REQUEST for resource#1
OTHERPORTAL->MYPORTAL: RESPONSE resource#1
MYPORTAL rewrite all URLs in resource#1 (for example
to over Bourbon Street
tonight..."