How do I run a script at shut down?

Hi folks,
I wrote a script that runs at login that gets my dynamic IP and creates a simple web page with a link to my local computer address for Personal Web Sharing, and then uploads that web page with the link to my ISP homepage server.
I wrote another script that creates a web page with no link, but contains a message that my home computer is shut down.
This way, my ISP homepage can have a file that either points to my dynamic IP or has a message that my web server is down.
So How do I get the shut down script to run at shut down?
The shutdown script is basically just this to upload an existing html file:
curl -T shutdown_message.html -u userid:password ftp://ftp.web.isp.server.com/
or you can dynamically create an html file with current date and expected date you will be back on-line, or whatever, with some simple perl code.
Thanks.
G3 Desktop, SonnetEncoreZIF G4 1GHz, 768MB, WingsAV-6MB, DVR-106D, 60GB Maxtor Mac OS X (10.4.7) PCI: TempoUltraATA66-120GB Maxtor, 120GB Seagate; TangoUSB/FW; Radeon9200-17"LCD

Thanks, guys. For the most part I think the DSL keeps the same IP except when I power down. My power went out just as I finished my login upload script, so my first test was out of necessity, and it worked. I could set it up as a cron job on my local machine to regularly test the IP and upload the page.
reese, When I have a power loss, or non-planned abnormal shutdown, my web page will be out of sync, unless I use something on the ISP server, so that is a good point. I am not sure what kind of scripts I can run on my ISP web server. I don't know if I can set up a regularly scheduled script, or if it would only respond to requests, then it could perform the test on demand. I need to give that some more study. Good suggestion.
As far as a normal planned shutdown, I thought of one possible work around: to create a script that runs my upload and then executes the shutdown, either by AppleScript or UNIX shutdown command line, not sure which is the most graceful.
Gary, I looked in the /System/Library/StartupItems and found the Apache scripts in there. They have a StartService and StopService methods defined. I think I could use that as a template to create my own, or just add my scripts to the Apache methods. Since basically I want to run something as Apache is started and again when it stops. That may be the most graceful method. As Apache can get shut down when the machine remains on via System Preferences. You solved my problem Gary, but I marked your message as helpful already. Post back again and I'll give you the Solved Star & points.
G3 Desktop, SonnetEncoreZIF G4 1GHz, 768MB, WingsAV-6MB, DVR-106D, 60GB Maxtor Mac OS X (10.4.7) PCI: TempoUltraATA66-120GB Maxtor, 120GB Seagate; TangoUSB/FW; Radeon9200-17"LCD

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ml wrote:
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How do I run a script at shut down?

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