attaching event handlers to tags with javascript

Say I had <select id="something" name="something"
onchange="demo(this.value)"> but didn't want to define the onchange
event handler in the select tag, itself. ie. I wanted to attach it,
latter, by doing something like...

document.getElementById('something').attachEvent('onchange',demo);

or this:

document.getElementById('something').onchange = demo;

How would I go about passing parameters to demo as I do in the select
tag? Is there a way I could reference this.value in demo without
having to pass it as a parameter to demo?

.

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