Unable to login in authentication window

Hi

i am not able to close the java script popup windows using watir.

require ‘watir’
require ‘win32ole’

ie = Watir::IE.new
@user = ‘username’
@pass = ‘password’
@url = ‘internal site’
@login_title = "Connect to "
ie.goto(@url)

Watir.autoit.WinWait(‘Connect to ‘)
Watir.autoit.Send(@user)
Watir.autoit.Send(’{TAB}’)
Watir.autoit.Send(@pass)
Watir.autoit.Send(’{ENTER}’)

it opens the authentication window… but does not enters username and
password.

pls help