using jquery and easing js, smooth scroll to a specific anchor links

gistfile1.js

// smooth scroll to a specific section on the same page
	function smoothScroll (selector) {
		$('html, body').animate(
		{
			scrollTop: jQuery(selector).offset().top
		},
		600,
		'easeOutCubic', // curves from http://easings.net/
		function(){
			$('#company').focus();
		});
	}
	
	$(".sign-up-button").on('click', function(e) {
		smoothScroll ('.section-sign-up'); // target destination div
		return false;
	});