// left: 37, up: 38, right: 39, down: 40,

// spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36

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;

}