Browser differences/support for cusor keys and mouse click

[jtbarnes3rd]

I want all the controls to work the same with all browsers. So far I've commented out some browser checks that just returned from a function. This helped when displaying the Autocomplete widget but I'm having trouble with the arrow up and down keys not working in the displayed selection set, rather the cursor just moves to the start and end of the text box. I've added checks for chrome and webkit capabilities to the BrowserCheck function but I still can't get these cursor keys to work nor does the mouse select from the drop down list. Any help with capturing the correct key event for the different browsers would be greatly appreciated.

I've tried editing the captured events from information found in this url
http://unixpapa.com/js/key.html