Load Balance multiple gateways?

Im looking for help with load-balancing. I have three ADSL lines at the moment that need to be balanced, can anyone help? When I use just one line, everything works fine, but as soon as I add the extra lines the trouble begins... Im new to load-balancing and have tried to make sense of the scripts that are posted, but I can`t seem to get the hang of it - will the 2-line senario where you mark every even & odd packet still apply?
Please help!!! :confused:

What Do You Want TO DO please write Detailed