Write a JavaScript program to change background color of webpage automatically after some delay.
<html>
<head>
<title>Animate background color of webpage</title>
<script>
setTimeout("document.bgColor='white'", 1000)
setTimeout("document.bgColor='lightpink'", 1500)
setTimeout("document.bgColor = 'pink'", 2000)
setTimeout("document.bgColor = 'deeppink'", 2500)
setTimeout("document.bgColor = 'red'", 3000)
setTimeout("document.bgColor = 'tomato'", 3500)
setTimeout("document.bgColor = 'darkred'", 4000)
</script>
</head>
<body>
</body>
</html>
