( function( $ ) {
	$(document).ready(function() {
			
		//back to top
		var scrollTrigger = 500;
		$(window).on('scroll', function () {
			var scrollTop = $(window).scrollTop();
			if( scrollTop > scrollTrigger ) {
				$('#back-to-top').addClass('back-to-top-show');
			} else {
				$('#back-to-top').removeClass('back-to-top-show');
			}
		});
				
		$('#back-to-top').on('click', function (e) {
			e.preventDefault();
			$('html,body').animate({
				scrollTop: 0
			}, 700);
		});
		//back to top END
			
	});
} )( jQuery );