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PIX 515E Transparent Mode and VLANS Help

Hello, i have this network diagram,

ISP--PIXTransparentMode--Switch 2950--Servers, my ISP gives me the Ip network, all servers use the same gateway (ISP) same mask,right now switch is plane no vlans and evertyhing working fine and i need to create 2 vlans in my switch, i create it , i assigned the ports for vlans, in the port in switch where the firewall is connected is in switchport mode trunk, but after this change, my servers dont reach gateway neither vlan A and vlan B, did i miss something, they are using the same IP's, gateway,etc, do i need to do something in the PIX 515E in transparent mode?, i just need to create vlans in switch but i cannot reach the gateway, i just have on ISP.

I hope you help me asap