Alexus89,
jQuery(window).load(function() {
var a = jQuery(".tabbed_navigation li"),
b = jQuery(".el .slide"),
c = 1;
b.hide();
jQuery(".tabbed_navigation").on("click", "li", function() {
var d = a.index(this);
if(d == c) return;
a.removeClass("current");
a.eq(d).addClass("current");
b.eq(d).stop(!0, !0).show("fade", 500);
b.eq(c).stop(!0, !0).hide("fade",1500);
c = d;
});
a.eq(0).click();
jQuery(".arrow_navigation .right, .arrow_navigation .left").on("click", function() {
var k = c;
k += jQuery(this).is('.right') ? 1 : -1;
k == b.length && (k = 0);
0 > k && (k = b.length - 1);
a.eq(k).click();
});
});