JQuery Searchable Select Plugin

This is my first release of this plugin, many things need to get better, yes, but I think as it is will still help and allow me to upgrade it with your suggestions and feedback.
The usage is:

$("some selector for selects").searchable();

//To use parameters:
$("some selector for selects").searchable({arrowImage: 'some path'});

The available parameters are:
arrowImage: absolute image path
arrowImageOver: absolute image path
arrowImageDown: absolute image path
highlightItemBgColor: css color
highlightItemTextColor: css color
elementStyle: css style ()


You can download it here