Swap 2 Paragraph Values in JavaScript

Swap values between the two paragraphs when “Swap” button is clicked:

<html>
<head>
<title>DHTML</title>
<head>
<script language="JavaScript">

function swapIt(){
var _one = document.getElementById("info1").innerHTML;
var _two = document.getElementById("info2").innerHTML;

document.getElementById("info1").innerHTML=_two;
document.getElementById("info2").innerHTML=_one;
}

</script>
</head>

<body>
<p id="info1">Hello World!</p>
<p id="info2">Not again!</p>
<input type ="button" value="Swap" onClick="swapIt()">
</body>
</html>

===========================================
Example:

Hello World!

Not again!