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any idea how to update a dropdown box after the other dropdown box is changed?

I use prototype for this. I have the php script which output the results in html (looped by php). The other page uses ajax prototype with ajax.updater and ajax.insertion, but it just put the results as normal text without the html part. Is there any special extension for populating that kind of dropdown box with prototype? I tried the documentation from but not all of the extension has at least an example. Thanks