onChange javascript

<html>
<head>
<script type="text/javascript">
function changeText()
{
    var selected = document.form1.sel.value;
    document.form1.txtInput.value = "You have selected "+;
}
</script>
</head>
<body>
<form name="form1">
<select name="sel" onChange=changeText()>
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="D">D</option>
</select>
<input type="text" name="txtInput" />
</form>
</body>
</html>