internet and programs are not working same time?

I have one domian server 2003 and client xp pc, My domain is IP address 193.15.30.10, default gateway 193.15.30.100, DNS 193.15.30.10 ok, My client xp pc IP is 193.15.30.15, gw 193.15.30.100, DNS 193.15.30.10 ok both computer are working fine with ADSL router.
My Questions is I got a DSL line for internet purpose, now i have internet modem with network cable. In my xp client pc IP when i put Automatically and put internet modem network cable. internet is working fine, but my server is not connecting or not working ………???????????? again i put xp clent ip address server is connecting but internet is not working ????????????? please give me the solutions friends

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suresh