function cascade(casc) {
  var x = casc;
  for (var i=1;i<x;i++) {
    //alert (i);
    var show = 'showproductdiv'+i;
    switchMenu(show);
    //alert (show);
  }
  switchMenu('select');
}

function switchMenu(obj) {
  var el = document.getElementById(obj);
  if (el.style.display != "none") {
    el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}