Web Forms :: Opening Two Pages (almost) At The Same Time?

I have a page that opens up displaying information based on a querystring. What I would like to do when this page opens is open another page. After x seconds, I want to close the original page.So, what I have done is the following

1) used Page_load page event to display the info based on a query string (no issues)

2) I call a function to open another page using:

Response.Write"<script language='javascript'> {window.open('http://www.example.com/'
& "', '');}</script>")

3) I have a, ajax timer_tick function that closes the original window using:

Response.Write(

"<script language='javascript'> {window.open('close.htm', '_self');}</script>")

The problem I have is that when the original window closes, it calls the function (point 2)) to open the secondary window again. I was just wondering how I can stop this from happening (basically the second page is opened twice).