Trying to test onchange fire and autocomplete. This problem is discussed in detail here.
When you use IE's autocomplete feature and click on an item from your autocomplete list, then leave the field; onchange doesn't fire.
To load stuff in your autocomplete list you need to fill out the form once, and hit submit. Then when you start to type those entries the second time, you can select them from the autocomplete list.
Update: a workaround has been identified and has a test page here