var ac_max_result_display = 20; //(no. of suggestion to show in suggestion list)
var ac_result_scroll = true; //(allow scrolling in suggestion list)
var ac_result_width = 256; //(suggestion list width)
var ac_result_height = 300; //(suggestion list height)
var ac_onClick_2_link = true;  //(go to a specified link when user press enter or tab after search)
var ac_image_width = '40px'; //(the image width in suggestion list, if any)