Untitled

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
function fotka()
{
var hehe=document.getElementById("selekt").value;
hehe=parseInt(hehe);
switch(hehe)
{
case 1:
document.getElementById("photo").src="1.png";
break;
case 2:
document.getElementById("photo").src="2.png";
break;
case 3:
document.getElementById("photo").src="3.jpg";
break;
}
}
</script>
</head>
<body>
<center>
<select id="selekt">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input type="submit" value="Wybierz" onclick="fotka()">
<br />
<img id="photo">
<center>
</body>
</html>