function showArtsInfo(el,arts_id) {
  navRoot = el.parentNode;//document.getElementById("artsen");
  for (i=0; i<navRoot.childNodes.length; i++) {
    node = navRoot.childNodes[i];
    if (node.className == "arts" && node.id == el.id) {
      node.className = node.className + ' selected_arts';
    }
    if (node.className == "arts selected_arts" && node.id != el.id) {
      node.className = 'arts';
    }
  }
  new Effect.Fade('arts_info', {duration:0.5,afterFinish:function() {updateArtsInfo(arts_id);}});
}
function updateArtsInfo(arts_id) {
  new Ajax.Updater('arts_info', '/getArtsInfo', {parameters:'arts_id='+arts_id,evalScripts:true,onComplete:function() {makeVisible();}});
}
function makeVisible() {
  new Effect.Appear('arts_info', {duration:0.5});
}