Hey again,
It’s funny because the smiley you’ve used is actually closer to the solution that you might think ??
I can’t really say I’m good with jQuery but this problem is related to the use of $, please see the following:
jQuery library included with WordPress is set to the noConflict() mode (see wp-includes/js/jquery/jquery.js). This is to prevent compatibility problems with other JavaScript libraries that WordPress can link.
In the noConflict() mode, the global $ shortcut for jQuery is not available.
The file you’re looking for is /wp-content/themes/mts_best/js/customscript.js starting on lines starting on lines 77, you can either replace $ with jQuery or use something like this
jQuery(function ($) { ...
I’ve found the following link which you might find helpful https://stackoverflow.com/questions/12343714/typeerror-is-not-a-function-when-calling-jquery-function.
Hope this helps ??
Cheers,
Bojan