There are basically two reasons for this error.
- Or you did not include the required plugin.
- You have included jQuery twice.
You do the second thing, including jQuery twice.
jQuery 1.6.2 at the top (before flexslider js) and jQuery 1.9.1 at the bottom (right before </body> )
Please correct this and the error will disappear.
ps Use $(document).ready() instead of $(window).load() and do not use frames
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