EXPERT RESPONSE
Your ISPs do not have to do anything. To load balance, the first step is to create an access list that will divide your network into two. So with access-list you need to define half the IP addresses on one link and therest on another link.
Lets say you network is 172.16.128.0/24. "Access-list 1 permit ip 10.172.16.128.0 0.0.0.254" will permit only even IPs. So now you have two subnets. You might have to change this per your requirements and IPs. Now you can creat a route map.
Route map 10 ISP1_primary
Match access-list 1
Set interface ISP1_interface
Route map 20 ISP1_primary
Match access-list 1
Set interface ISP2_interface
Similarly you need to create one more route map for second ISP.
Route map 10 ISP2_primary
Match access-list 2
Set interface ISP2_interface
Route map 20 ISP1_primary
Match access-list 2
Set interface ISP1_interface
Access-list two is another access-list for matching the networks. You need to devise your own ways to divide the network. One more option is to add floating static routes on the routers.
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