I tried this in the past....even by including my own AJAX library in the scripting resources. I could never get it to work. I think it is just a limitation of it (likely for security reasons and such for the Reader). You might be able to do some kind of "lowbrow" solution using strictly the scripting within your form (ie. no callbacks to outside sources) but then you might also hit some performance and usability limitations there too (such as screen flicker on calling "on key press" every time the user started to type something in). You could possibly dynamically load a hidden dropdown list (as mentioned above) and then use that for the "suggestions" in your input box as the user typed in....but again, possibly not too user friendly/pretty.
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