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Before posting, please read http://watir.com/support. In short: search before you ask, be nice.
watir-...@googlegroups.com
http://groups.google.com/group/watir-general
watir-genera...@googlegroups.com
The particular thing to note is the resizing controller that appears--that's how you know you've clicked it.
Now, run this code:
require 'watir-webdriver'
browser = Watir::Browser.new :firefox
browser.goto "http://www.tinymce.com/tryit/full.php"
browser.frame(:id=>"content_ifr").image(:src=>"img/tlogo.png").click
sleep 10 # So that the window doesn't close immediately