Autocomplete function in Node Reference Field

While using IME to input CJK characters in autocomplete nodereference field, I found autocomplete may not work correctly in Firefox and IE. However in Google Chrome, it works well. This bug could be found in line 88 of misc/autocomplete.js. After choosing a CJK character and press Enter, Firefox and IE just return the keycode 13 (Enter) and it doesn't trigger the jquery search method. But using Google Chrome, browser indeed returns all keycodes and finally trigger the jquery method. The attachment is my rough fix. Welcome to improve it.