javascript scroll to an element if it isn't visible

gistfile1.js

function scroll_to_if_not_visible(finder) {
  var postop = $(finder).offset().top, win = $(window);
  var posbottom = postop + $(finder).height();
  
  if (posbottom > (win.height() + win.scrollTop())) {
    $(finder).get(0).scrollIntoView(false);
  }
  else if (postop < win.scrollTop()) {
    $(finder).get(0).scrollIntoView(true);
  }
}