/*global document, window */

var menu_functions = {
  setup_menus : function() {
    var tds = document.getElementById('menu').getElementsByTagName('td');

    for (var i=0; i < tds.length; i++) {
      tds[i].ul_menu = tds[i].getElementsByTagName('ul')[0];
      if (tds[i].ul_menu) {
        tds[i].onmouseover = menu_functions.over;
        tds[i].onmouseout = menu_functions.out;
      }
    }
  },
  over : function () {this.ul_menu.style.display = 'block';},
  out : function () {this.ul_menu.style.display = 'none';}
};

window.onload = menu_functions.setup_menus;