Vlan with different default gateway

[fiza]

Currently got vlans set up all using our smoothwall as the default gateway. Now have a separate router for VoIP and need to setup new vlan and point it's default gateway to the router IP. I have a procurve layer 3 switch I am doing this on. Am I able to setup a different default gateway for this vlan. Not good on the CLI but I have tried doing it using the GUI but the default gateway just switches back to the smoothwall box. Is it possible to do?

[ITGuyWestMidlands]

Just change the default Gateway that DHCP is dishing out to the new router.