Here is the problem you are facing:
Uncaught TypeError: Object [object Object] has no method 'flexslider'
It also seems like you are loading your jQuery file after the flexslider file. To resolve this, try keeping all your .js files in one location, with the jQuery file at the top.
You currently have two jQuery files loaded on the same page. Typically, you only need one unless intentional.
Consider placing your script...
$(window).load(function() {
$('.flexslider').flexslider();
});
...at the bottom of the page within a script tag before the end of the body instead of within the head. The script will still wait until the page loads.
UPDATE!
Great progress so far! I can see the changes you made on your page through the web console.
To remove the error message:
Uncaught TypeError: Object [object Object] has no method 'on'
Remove the jQuery 1.6.2 file from the top of your page and place the flexslider.js file at the bottom of your page.