function moveNavigation(){
  contentMinHeight = 555;
  if (document.getElementById('content').offsetHeight < contentMinHeight) {
    document.getElementById('content').style.height = contentMinHeight;
  }
  //document.getElementById('left_nav').style.marginTop = document.getElementById('footer').offsetTop - 274 - 350;
}
window.onload = moveNavigation;
window.onresize = moveNavigation;