Where to put simple functions in an Ember project

So... while I'm learning all of this Ember CLI world - things are going well. However, I can't seem to understand where all the normal ol javascript utility stuff I use on a normal project goes... for example --- this sticky footer thing... where do I put this? It's blowing my mind...

// dynamic weighted footer
var watchFooter = function() {

  // define the height variable
  var footerHeight;

    // get the height of the footer and store it in 'footerHeight'
    footerHeight = $('.container.footer').outerHeight();

  // Share that info with the dependent elements
  $('.footer-buffer').css('height', footerHeight);
  $('.container.master').css('margin-bottom', -(footerHeight));

};

// run on window resize - and on load
$(window).resize(watchFooter).trigger('resize');