( 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 );
