www.dhtmlgoodies.com

I'm not sure what’s wrong with it but it looks like its not actively recognizing the characters entered in or maybe when you type them in fast, it doesn’t quite work. Maybe theres some sort of a catch problem.

Heres some screen shots:

I think it has bug on the
ajax-dynamic-list.js

Change the line 209
From:
var url = ajax_list_externalFile + '?' + paramToExternalFile + '=1&letters=' + inputObj.value.replace(" ","+");


To:
var url = ajax_list_externalFile + '?' + paramToExternalFile + '=1&'+inputObj.name+'='+inputObj.value+'&letters=' + inputObj.value.replace(" ","+");

Let me know whether it can solve your problem, thanks