Get last option clicked in multi select box

Is there a way to pass the last option clicked to a JavaScript function/retrieve the value or index of the last option clicked using an onchange event?

I have a form with a multi select box. If the user has selected an option in the select box, an alert needs to pop up asking if selection is required or optional. However, if they are deselecting an option, no alert occurs.

So if user clicks options 2, 3, and 5 an alert box would come up each time, but if they went back and deselected option 3, no alert pops up.

Using MSIE

Thanks,

KTRI

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