var listMainNav = $$('#id_of_nav a');
listMainNav.each(function(element) {

        var fx = new Fx.Styles(element, {duration:400, wait:false});

        element.addEvent('mouseenter', function(){
                fx.start({
                        /*'margin-left': 12,*/
                        color: '#cc0000'
                });
        });

        element.addEvent('mouseleave', function(){
                fx.start({
                        /*'margin-left': 0,*/
                        color: '#fff'
                });
        });

});

/*listMainNav.each(function(element) {

        var fx = new Fx.Styles(element, {duration:400, wait:false});

        element.addEvent('mouseenter', function(){
                fx.start({
                        'margin-left': 20,
                        'background-color': '#0066cc',
                        color: '#fff'
                });
        });

        element.addEvent('mouseleave', function(){
                fx.start({
                        'margin-left': 0,
                        'background-color': '#ff9900',
                        color: '#000'
                });
        });

});*/