snovapavel,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
html,body,.fader{margin:0;height:100%; padding: 0;}
.fader ul{position:relative;list-style:none;height:100%;margin:0;}
.fader ul li{opacity:0;position:absolute;height:100%;left:0}
.fader img{height:100%}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
var p = $(".fader li"),
len = p.length,
indx = len-1;
! function go() {
p.eq(indx).fadeTo(1200,0);
indx = ++indx % len;
p.eq(indx).fadeTo(1200,1);
window.setTimeout(go, (6000 * Math.random() | 0) + 3200)
}()
});
</script>
</head>
<body>
<div class="fader">
<ul>
<li><img src="http://placehold.it/500x500/220022?text=1"></li>
<li><img src="http://placehold.it/500x500/002200?text=2"></li>
<li><img src="http://placehold.it/500x500/0000FF?text=3"></li>
</ul>
</div>
</body>
</html>