window.addEvent('domready', function() {
    var triggers = $$( "#simplelists-navigator a.simplelist-hover" );
    var blocks = $$( ".simplelists-item" );
    var fx = new Fx.Elements(triggers, {wait: false, duration: 300});
    triggers.each(function(trigger, i) {
        trigger.addEvent("mouseenter", function(event) {
            blocks.each(function(block, j) {
                block.setStyle( 'display', 'none' );
                block.setStyle( 'visibility', 'hidden' );
            });
            thisblock = trigger.id.replace( '-hover', '' ) ;
            $(thisblock).setStyle( 'display', 'block' );
            $(thisblock).setStyle( 'visibility', 'visible' );
        });
    });
});