You are using jQuery before referencing it. Simply make sure that the jQuery reference is in the <head> section, possibly before other js files.
solved ReferenceError: $ is not defined in firebug console [duplicate]
 
You are using jQuery before referencing it. Simply make sure that the jQuery reference is in the <head> section, possibly before other js files.
solved ReferenceError: $ is not defined in firebug console [duplicate]