I need to put a PIX 501 in behind a cable modem. What configuration do I need so the Pix will recieve an address?

I need to put a Cisco Pix 501 Firewall behind a cable modem.  I've done this before when I've had staic IPs to use, but this time I don't.  Is there a way I can configure the Pix to recieve a IP address from the cable modem?  Thanks
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It should look something like this.

To get the ip address from your cable company

ip address outside dhcp setroute

allow access to the internet.

global (outside) 1 interface
nat (inside) 1 0 0

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