// menu
var menu1_on = new Image();
var menu2_on = new Image();
var menu3_on = new Image();
var menu4_on = new Image();
var menu5_on = new Image();
var menu1_off = new Image();
var menu2_off = new Image();
var menu3_off = new Image();
var menu4_off = new Image();
var menu5_off = new Image();
menu1_on.src = '/images/menu_1_on.png';
menu2_on.src = '/images/menu_2_on.png';
menu3_on.src = '/images/menu_3_on.png';
menu4_on.src = '/images/menu_4_on.png';
menu5_on.src = '/images/menu_5_on.png';
menu1_off.src = '/images/menu_1_off.png';
menu2_off.src = '/images/menu_2_off.png';
menu3_off.src = '/images/menu_3_off.png';
menu4_off.src = '/images/menu_4_off.png';
menu5_off.src = '/images/menu_5_off.png';

function selectMenu(num) {
  men = document.getElementById('menu'+num);
  if (men == undefined) { return false; }
  men.src = eval('menu'+num+'_on.src');
}

function deselectMenu(num) {
  men = document.getElementById('menu'+num);
  if (men == undefined) { return false; }
  men.src = eval('menu'+num+'_off.src');
}