xBreadcrumbs can convert your multi-level unordered list into a breadcrumbs element with very usable navigation functionality. Below is a demonstration of the plug-in.
An implementation of xBreadcrumbs with sub-level drop-down menus and collapsible mode enabled and set to "slide" instead of the default "fade".
jQuery(function($){ $("#breadcrumbs-2").xBreadcrumbs({ collapsible: true, showEffect: "slide" }); });