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The mobile menu does not work on link 1 but does work for me on link 2 on my iPhone 4 with Safari.
 
Thanks for helping me !

Could you tell me what is happening now when you click the menu ?
(In theory it should propmpt window with a test message )
 
The background behind the 3 horizontal bars changes from white to green but nothing else happens.
 
Yes it appears to work perfectly - brings up the menu and I was then able to go to the "About Us" (didn't test the other menu choices).
 
Ok it seems that I detected source of problem. Thanks for your help .
 
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