function adjustHeight(){
    main_cont= document.getElementById('main-container');
  art_cont= document.getElementById('article');
  menu_cont= document.getElementById('sidebar');
  height = document.body.offsetHeight;
  main_cont.style.height = height-60+"px";
  art_cont.style.height = height-320+"px";
  menu_cont.style.height = height-320+"px";
}