Automatic shutdown of Radio when WAN goes down

I have an autonomous CISCO 877 wireless router IOS 12.4(9)T6
I want the radio to shutdown if there is no egress port -( usually ADSL but concievably Ethernet) but I can't find the commands.
I had a problem some time ago with another non-CISCO AP that was associating with local clients because they saw it as a strong signal but then couldn't route the packets because the Ethernet was down. Other nearby APs could have taken them over if its radio had been switched off.
I can't believe there isn't a way to do this but I'm looking for the commands in vain. This works a bit like a backup but instead of bringing a port up when another fails it should shut down the radio when the monitored port fails.
Sorry if this is a dumb question but I've trawled through docs and postings: maybe I'm getting the wrong keywords

Thanks Roman - exactly what I needed.
I have added the config below for anyone else who might be interested - although I only used the Ethernet Interface as a test
and have yet to try it with the ATM or dialer interfaces.
event manager applet RADOFF
event syslog pattern "Interface FastEthernet3, changed state to down"
action 1.0 cli command "en"
action 1.1 cli command "conf t"
action 1.2 cli command "int do0"
action 1.3 cli command "shut"
event manager applet RADON
event syslog pattern "Interface FastEthernet3, changed state to up"
action 1.0 cli command "en"
action 1.1 cli command "conf t"
action 1.2 cli command "int do0"
action 1.3 cli command "no shut"

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