[jQuery] Selecting a value with up down keys

Hi,

I'm trying to figure out how to select a value from a list that is
filled dynamically using ajax (auto suggest).
Take a  look at the small code:

when typing in a name by the keyboard this function is called:

function lookup(inputString,a) {

                if(inputString.length == 0) {
                        // Hide the suggestion box.
                        $('#suggestions').hide();
                } else {
                        $.post("autoComplete/rpc.php",  {queryString: 
""+inputString+""} ,
function(data){
                                if(data.length >1) {
                                        $('#suggestions').show();
                                        $('#autoSuggestionsList').html(data);
                                }
                        });
                }
        }

An when choosing a value from the given back values list  $
('#autoSuggestionsList').html(data); then the next function does his
work:

        function fill(thisValue) {
                $('#inputString').val(thisValue);
                $('#suggestions').fadeOut("slow")
        }


But now i want to use the up and down keyboard keys to get to the next
value and choose it by enter.
I wonder if there is a simple jquery solution for this?


thank you for your help in advance :)
regards
m.sirin