$(document).ready(function() { 
    $("#inputString").keyup(function() {
        lookup(this.value); 
    }); 
});

function lookup(inputString) {
    if(inputString.length == 0) {
        $("#suggestions").hide();
    } else {
        $.post("/rpc.php", {queryString: ""+inputString+""}, function(data){
            if(data.length >0) {
                $("#suggestions").show();
                $("#autoSuggestionsList").html(data);
            }
        });
    }
}