<html>
<head>
<style>
input { display:none }
</style>
<script>
var index = 0;
var links = new Array (
"https://javascript.ru/cat/list/donkey.gif",
"https://javascript.ru/cat/list/firefox.gif",
"https://javascript.ru/cat/list/opera.gif"
);
function slide(v) {
var element = document.getElementById("pic");
index += 1 * v;
if(index > links.length - 1) index = 0;
if( index == 1 ) { togglee.style.display = 'block'; }
else { togglee.style.display = 'none'; }
element.src = links[index];
}
</script>
</head>
<body>
<a href="#" onclick="slide(1)">Вперед</a>
<img id="pic" src="https://javascript.ru/cat/list/donkey.gif" style="position:absolute; left:10%; top:20%" />
<div id="botton">
<input type="button" id="togglee" value="Togglee" />
</div>
</body>
</html>