Need help with launchd

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Hi,

I'm working on a way to get a decent "Night Mode" on my iPhone.
I already figured out how to shut down audio completely (com.apple.mediaserverd.plist) but what I now need is a way to schedule my two scripts to turn audio off and back on. Normally I would do that kind of stuff with cronjobs, but since firmware 2 does not have cron, but launchd instead, I ran into problems.
I can't figure out how the XML file is supposed to look like, and I don't know If I have to load it every time I reboot my iPhone.

So I need to execute /private/var/mobile/silent.sh on Saturday 1:00 and /private/var/mobile/loud.sh on Sunday 13:00 and so on (different times on different weekdays...)

So I really need some help guys, especially since I'm a Linux guy and don't exactly now my way around Apples OS!
Maybe If someone of the more sophisticated developers has some time, we could whip up a real App with a GUI out of this!

Any help very much appreciated

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My plist now looks like this

 <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.silent-hour</string>
    <key>ProgramArguments</key>
    <array>
        <string>/private/var/mobile/silent.sh</string>
    </array>
    <key>StartCalenderInterval</key>
                        <dict>
                        <key>Hour</key>
                        <integer>20</integer>
                        <key>Minute</key>
                        <integer>15</integer>
                        </dict>

</dict>
</plist>

but it will not get executed at that time