[c-nsp] load balance over two unequal cost links?

[Matt Bazan]

Got the following:

  A----------B
   \        /
    \      /
     \    /
      \  /
       C

Cisco 3640's.  T1's between sites.  

I'm looking for a way to load balance traffic from site A to site B
using the link between A <> B and A <> C <> B.  Can I split traffic
based upon a particular port on the A router and load balance it using
both paths to B from A?  Thanks.