Or you could edit your index page and write a redirect to the top level page you want to start with.
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Here's the code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Your Page Title</title>
<meta http-equiv="REFRESH" content="0;url=http://www.the-domain-you-want-to-redirect-to.com"></HEAD>
<BODY>
You will be redirected in 0 seconds to...
</BODY>
</HTML>
Code Description:
<meta http-equiv="REFRESH" content="0;url=http://www.the-domain-you-want-to-redirect-to.com"> is the part that actually does the redirecting.
The number preceding the url (in this case zero) tells the browser the number of seconds to wait before redirecting to the new url.
You could set this to 5 and add some optional text to your page - something like:
"Please wait while we redirect you to our new site".
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Ok now tell me Ken why the blazes would I not want my index page to be my home page...
You can add browser, resolution, or language detection to your index and use the result to redirect to the 'right' home starting page..