Peoplesoft Portal 9.1

Is there a way to build a new Peoplesoft Portal menu (javascript, jquery, prototype for ex) and stillmanage Portal IA on backend

Is there a way to build a new Peoplesoft Portal menu (using javascript, jquery, prototype for ex) and still manage Portal IA ans security on the backend. Al of our users really dislaike thstandard Left navigation menu and also the breadcrumbs menu is not a big hit either. Would like to be abe to somehow pull the portal IA etc... into a nice javascript or css menu - anthing that would give the left nav a fresher more user friendly better looking menu.