var data = new Array();
AutoComplete_Create('search_f', data);

function getAutoCompleteResults(id) {
        var word = $F('search_f');

        if (word.length > 2) {
            var url = window.location.protocol + "//" + window.location.host + "/";
            url = url.concat("autoCompleteSearch.php");

            var myAjax = new Ajax.Request(
                url+'?autoCompleteWord='+word,
                {
                    method: 'get',
                    onComplete: function(originalRequest) {
                        AutoComplete_ShowDropdown(id, originalRequest.responseText);
                    }
                });
        } else {
            AutoComplete_ShowDropdown(id, false);
        }
}