$(function() {
 var $first = $('.js_contz .js_innerz:first');
 $first.addClass('active');
 stop_interval = setInterval("slideSwitchZZ()", 4000);

 $(".js_innerz").mouseover(function() {
 clearInterval( stop_interval);
 return false;
 });

 $(".js_innerz").mouseout(function() {
 stop_interval = setInterval("slideSwitchZZ()", 4000);
 return false;
 });
 });

 function slideSwitchZZ() {
 var $active = $('.js_contz .active');
 if ($active.length == 0) $active = $('.js_contz .js_innerz:last');
 var $next = $active.next().length ? $active.next() : $('.js_contz .js_innerz:first');
 $active.removeClass('active');
 $next.addClass('active');

 }