[LARTC] need help on multiple isp routing

[Anonymous]

here's my network layout


    ppp0 (ADSL 2048/256)
        |
        |                                ppp1 (SDSL 1024/1024)
        |                                    |
        -------- LINUX -------
                            |
                        eth0 (192.168.0.1 DHCP+DNS, Squid, Samba)
                            |
                            |
                -----8 port 100mbit dumb switch
                |                                        | | | |
    192.168.0.16/26                           | | |
                                                         | |  - DHCP 
assigned clients
                                                         |  ---  
(192.168.0.0/26)
                                                         -----

i need 192.168.0.16 to take ppp0 route for all it's needs (masquaraded on 
ppp0) and use transparent squid cache set up on 192.168.0.1 for www. while 
all other DHCP assigned clients would use masquerading on ppp1 for all their 
needs and use forced load-ballanced cache of second ISP.