If you want to keep them the old one, I would suggest an algorithm in your template of the start page to redirect to the new one.  If you just wanted to replace you could have the start page shortcut to the new one but this would always occur.

Thanks for the reply Mark.

I want to keep the old one , but now when user visits the website it should show the new start Page from there user can access the old start page .   But I really don't want to disturb the current start page as the child pages are too tightly coupled I have to lot of changes . 

Basically I want a basic welcome page , giving insight into the website.

You can check the url refferer of the request in the controller or page load.  If the referrer is not from the site, redirect.

If not cookie

  redirect to new start page

...

- Create a new page property on the old start page and link to the new start page/welcome page

- Update links to old start page with a parameter, e.g redirect=false

- Check in controller/page load for the url parameter and show old or new start page based on that.

Thanks Tim !!

Thats what I am planning to do . 

No problem, glad to help :)