I'm trying to use Watir to log into a page.  I can't seem to find the
login button in order to click on it.  From the Watir examples I've read
it seems I need the following code:

browser = Watir::Safari.new
browser.goto @login_page
browser.text_field(:name, 'UserID').set(ARGV[0])
browser.text_field(:name, 'Password').set(ARGV[1])
browser.button(:alt, 'Login').click

However, the final line doesn't do anything.  Note, the text_field lines
do correctly set the username and password.  Any idea how to fix this?

Here's the relavent html:

<FORM NAME="frmLogon"
ACTION="/myca/logon/us/action?request_type=LogLogonHandler&location=us_logon1"
METHOD="POST" onkeypress="formSub(event)">

... lots of stuff ...

  <input type='image' src ="/myca/logon/us/shared/images/btn_login.gif"
alt="Login" style="margin-top:5;margin-left:20;margin-bottom:22" border
= "0" tabIndex='5' onClick="javascript:loginNow();return false;">


... lots of stuff ...

</FORM>

Also, the full site is here:
https://online.americanexpress.com/myca/logon/us/action?request_type=LogonHandler&Face=en_US&DestPage=https://www99.americanexpress.com/myca/acctsumm/us/action%3Frequest_type%3Dauthreg_acctAccountSummary%26us_nu%3Dlogincontrol&Info=CUExpired
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