Jquery按键事件忽略箭头键

I have an input box that acts like a search (similar to facebook). I am using the jquery on key-press event which works fine. The problem is that I can't scroll down on the set of the results using the arrow keys, every time that one of them is pressed the search results are being regenerated. So is it possible to ignore the arrow keys / shift / tab etc. I have an input box that acts like a search (si