Save the following code as the default homepage file such as index.html and put it in the root directory.
Don't hide the backward address
<html>
<head>
<title>Redirect</title>
<meta http-equiv=refresh content=0;url=new site>
</head>
<body>
</body>
</html>
Hide the backward address
<html>
<head>
<title>Redirect</title>
</head>
<frameset framespacing=0 border=0 rows=0 frameborder=0>
<frame name=main src=new site scrolling=auto noresize>
</frameset>
</html>