Javascript error has me completely stumped - it is most likely very obvious

Javascript error has me completely stumped - it is most likely very obvious

Hello,
 
I am new to jQuery so please excuse me if the answer to my issue is very obvious - which I have a feeling it will be.  I used jQuery to add some roll-over drop down menus to the top navigation bar of my website.  Everything was working fine and the changes were pushed to production.  A few hours later though, we started getting a javascript exception from within the jQuery library while using Internet Explorer on both development and production!  I have searched and searched and have no idea what is causing it.
 
Would someone be kind enough to take a look at my site and point me in the right direction for fixing this?  The site is http://www.synergetechsolutions.com/ and the exception occurs whenever you rollover one of the drop down menu items.  I have pushed the documented version of jQuery to the server if that makes things easier to diagnose.
 
I would hate to roll back because the new menus look great.  Any help would be very much appreciated.
 
Thanks,
 
Brian P. Hamachek