open safari webpage with only 1 page

Scripting Forums AppleScript | Mac OS X
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#1

I’m trying to login to igoogle by applescript
I have used this to open the page, although it doesn’t work reliably.
It opens 2 pages 1 on the activate and 1 on the chosen page.
how can I get this script to open only the igoogle page?

property site_url : "https://www.google.com/accounts/ServiceLogin?service=ig&passive=true&continue=http://www.google.com/ig%3Fhl%3Den&followup=http://www.google.com/ig%3Fhl%3Den&cd=US&hl=en&nui=1&ltmpl=default"
tell application "Safari"
	activate
	open location site_url
	-- wait until page loaded
end tell

I also tried this shell script to no avail

set pageSource to do shell script "curl [url=https://www.google.com/accounts/ServiceLogin?continue=http://www.google.com/ig%3Fhl%3Den&followup=http://www.google.com/ig%3Fhl%3Den&service=ig&passive=true&cd=US&hl=en&nui=1&ltmpl=default]https://www.google.com/accounts/ServiceLogin?continue=http://www.google.com/ig%3Fhl%3Den&followup=http://www.google.com/ig%3Fhl%3Den&service=ig&passive=true&cd=US&hl=en&nui=1&ltmpl=default"[/url]
#2 
tell application "Safari"
	activate
	tell tab 1 of window 1 to open location site_url
end tell
#3

the activate command is still launching a browser so 2 are open.
I only want one browser window open to the site_url

#4 
tell application "Safari"
	activate
	if not (exists document 1) then
		make new document at beginning
	end if
	tell document 1
		set URL to site_url
	end tell
end tell