var DHTML = (document.getElementById || document.all || document.layers);
  
function swapElement(id,type){
  if (!DHTML) return;
  
  if (!type) { type = 'block';};
  
  var x = getObj(id);
  if (x.style.display == "none") {
    x.style.display = type;
  }
  else {
    x.style.display = "none";
  }
}
  
function expandMenu(menuPrefix,menuIndex,totalNumOfMenus){
  if (!DHTML) return;
  
  for(i = 1; i <= totalNumOfMenus; i++) {
    var x = getObj(menuPrefix+i);
    // Si el menu que queremos expandir, lo hacemos
    if (i == menuIndex) {
      x.style.display = "block";
    }
    else {
      x.style.display = "none";
    }
  }
}