Hi,
All you need to do is have two Equal cost path statements pointing to your next hop... I.E if this is for internet access
ip route 0.0.0.0 0.0.0.0 213.213.213.1
ip route 0.0.0.0 0.0.0.0 213.213.252.1
Here is an example on one of my 2600`s from a show IP route command
S* 0.0.0.0/0 [1/0] via 10.52.143.244
[1/0] via 10.52.143.5
the next hop devices being the routers on the other end of your T1`s
If you want packet by packet load balancing then you need to enable cisco CEF
#IP CEF
however a 2600 is a low end router, keep an eye on your CPU utilisation when you have implimented this.
#show processes cpu
If you dont use CEF then the router I beleive will do Per IP Session Loadbalancing or per destination ( i cannot remember ).
Hope this helps.
LEEroy
MCNE6,CCNA2,CWNA, Project+