two gateway with hp 5308xl switch

[mualni]

hi guys, i have 5308xl switch as a main switch with multiple vlans and one default gateway, all vlans routing are working fine and the default gateway is the firewall ip where our leased line connected. all users using the switch ip as gateway. recently i got a new internet line a normal line not leased, i want to connect all workstations to that internet line to reduce the load on the leased line, so how i can do that without losing ant communication between the vlans? i will have a new firewall device for the new internet line.

as i know the hp switch i have only accept one gatway as a default gateway so what's the best way to configure some of the vlans to use the leased line and others use the new internet line?

regards,