Problem with onchange event on SELECT

[javarunner]

I am using Ajax to provide dynamic HTML SELECTs in what is a very static legacy web app. I build the SELECT/OPTION tags using the DOM api. I set an attribute on each SELECT to point to an 'onchange' event.
Everything works fine until I port to IE7, in which the events do not fire. It works correctly in Firefox and Safari.
Does anyone know of a work-around for this odd IE behaviour?
TIA...

[javarunner]

Typical! I solved this issue right after I posted.
IE is not compliant with DOM rules, so the event is registered using:
document.getElementById('foo').onchange = foobar;
Hope this helps someone in the IE swamp.