JQuery :: Ajax Result Is Returned In The Wrong Sequence?

I have a text-box. On the event of `OnKeyup` a function is triggered that looks like this:

$.getJSON(url,function(data){
$.each(data, function(key, value) {
showSearchResult(value);
});
});

No my problem is that when you type really fast then the return search result does not always return relevant to the current value of the textbox.

[I did think of adding a very small time-interval on the onkeyup event but i thought there might be a cleverer way of doing it ]

This problem is because the Ajax calls do not sometimes return in the same sequence that they were fired.