scroll on anchor tag click within page

scroll.js

var height = $('header').height(); // element to offset scroll with (i.e. your navbar if it is fixed)
$('a[href*=#]').click(function() {
	if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
	&& location.hostname == this.hostname) {
		var $target = $(this.hash);
		$target = $target.length && $target
		|| $('[name=' + this.hash.slice(1) +']');
		if ($target.length) {
			var targetOffset = ($target.offset().top)-height; //offset from top based on element - this isn't required
			$('html,body')
			.animate({scrollTop: targetOffset}, 800);// set speed of animation
			return false;
    }
  }
});