fancybox2 / fancybox causes page to to jump to the top

I realize this is an old question, but I think I have found a good solution for it. The problem is that fancy box changes the overflow value of the body in order to hide the browser scrollbars.

As Dave Kiss points out, we can stop fancy box from doing this by adding the following parameters:

$('.image').fancybox({
  padding: 0,
  helpers: {
    overlay: {
      locked: false
    }
  }
});

But, now we can scroll the main page while looking at our fancy box window. It is better than jumping to the top of the page, but it is probably not what we really want.

We can prevent scrolling the right way by adding the next parameters:

    $('.image').fancybox({
      padding: 0,
      helpers: {
        overlay: {
          locked: false
        }
      },
    'beforeLoad': function(){
      disable_scroll();
        },
     'afterClose': function(){
       enable_scroll();
      }
    });

And add these functions from galambalaz. See: How to disable scrolling temporarily?

    var keys = [37, 38, 39, 40];

    function preventDefault(e) {
      e = e || window.event;
      if (e.preventDefault) e.preventDefault();
      e.returnValue = false;  
    }

    function keydown(e) {
        for (var i = keys.length; i--;) {
            if (e.keyCode === keys[i]) {
                preventDefault(e);
                return;
            }
        }
    }

    function wheel(e) {
      preventDefault(e);
    }

    function disable_scroll() {
      if (window.addEventListener) {
          window.addEventListener('DOMMouseScroll', wheel, false);
      }
      window.onmousewheel = document.onmousewheel = wheel;
      document.onkeydown = keydown;
    }

    function enable_scroll() {
        if (window.removeEventListener) {
            window.removeEventListener('DOMMouseScroll', wheel, false);
        }
        window.onmousewheel = document.onmousewheel = document.onkeydown = null;  
    }

This can actually be done with a helper in Fancybox 2.

$('.image').fancybox({
  helpers: {
    overlay: {
      locked: false
    }
  }
});

http://davekiss.com/prevent-fancybox-from-jumping-to-the-top-of-the-page/

Jordanj77 is correct but easiest solution is to just go to stylesheet jquery.fancybox.css and comment out the row saying overflow: hidden !important; in section .fancybox-lock