How to scroll HTML page to given anchor?

function scrollTo(hash) {
    location.hash = "#" + hash;
}

No jQuery required at all!

Way simpler:

var element_to_scroll_to = document.getElementById('anchorName2');
// Or:
var element_to_scroll_to = document.querySelectorAll('.my-element-class')[0];
// Or:
var element_to_scroll_to = $('.my-element-class')[0];
// Basically `element_to_scroll_to` just have to be a reference
// to any DOM element present on the page
// Then:
element_to_scroll_to.scrollIntoView();

You can use jQuerys .animate(), .offset() and scrollTop. Like

$(document.body).animate({
    'scrollTop':   $('#anchorName2').offset().top
}, 2000);

example link: http://jsbin.com/unasi3/edit

If you don't want to animate use .scrollTop() like

$(document.body).scrollTop($('#anchorName2').offset().top);

or javascripts native location.hash like

location.hash = '#' + anchorid;