load balancing with Cisco routers

hi
i’d like to configure a cisco routers 2800
it has 2 ISP connexion (ISDN ,ADSL)”WAN”
and 1 ethernet to “LAN”

could you please give me somme information about how can i do the folowing :

-1 the SMTP and ftp flow of data must be redirected to the 1 st ISP connexion”IDSN”

2- all the other flow of data like WWW,DNS,…
will be redirected to the 2nd ISP connexion “ADSL”

excuse me for my poor english 🙂
feel free to ask me if u need more information

Thank’s for ALL