I was looking around for a good HTML combo box (a drop-down list with a type-in text box), and found a good looking one over at Particletree (see Update Your Select Element to a Combo Box). There were a few quirks I found with it.

The text box used absolute positioning. As a result, if the location of the select element changed (perhaps due to another item on the page being shown or hidden), the text box would be in the wrong place.
The code was free-standing and applied event handlers directly, instead of using an event manager like one offered in Prototype‘s Event class.

To clean things up, I modified the code to work with the Prototype JavaScript library, converting element selectors and event management. I also added a hack to handle positioning issues by calling a routine that repositions the text box every 0.05 seconds. Though far from efficient, it didn’t cause any flickering or processor utilization. If JavaScript . . .

→ Read More: Select/input combo box using Prototype