conflict between mcdropdown.js and interface.js

conflict between mcdropdown.js and interface.js

im using both plugin in my website
For purpose of debuging iv test each separetly... and works well
But together ...the mcdropdownmenu click event Activate wherever i click on my page
this is my site
http://www.ma117.info/index6.html
even a stripdown minimal site to test
http://www.ma117.info/index7.html

Someone have a idea to solve this conflict
Thanks