if(!image_base) {
  var image_base = '/images/';
}
function changeImage(id,state,ext){
  state = state || '';
  if( ext == undefined ) {
    var before = document.getElementById(id).src;
    if( before.match(/\.([^.]+)$/) )
      ext = RegExp.$1;
    else
      ext = 'jpg';
  }

  if(state) state = '-'+state;
  document.getElementById(id).src = image_base+id+state+'.'+ext;
}

function preload(menus) {
  var image = new Image;
  for(i=0;i<menus.length;i++)
    image.src = image_base + menus[i];
}

function open_photo(url) {
  photo_win = window.open(url+'', 'photo_win', 'width=500,height=500,scrollbars=yes');
  photo_wein.focus();

  return false;
}