pqSelect is a standalone jQueryUI widget which turns browsers' native single and multiple select lists
into easy to use drop downs embellished with checkboxes, search box, keyboard navigation
and rich set of options, methods and events.
It works in all major browsers (IE8+, Chrome, Firefox, Safari, Opera)
and across desktops, tablets and touch devices.
It also supports grouping and disabled options.
Please check here for demos.