var uls = document.getElementsByTagName('ul');
for (var i = 0; i < uls.length; i++) {
  if (uls[i].parentNode.className.search(/(n[1-9])/) >= 0) {
    uls[i].onmouseover = function() { this.parentNode.className += (this.parentNode.className ? ' ' : '') + 'mouseover'; };
    uls[i].onmouseout = function() { this.parentNode.className = this.parentNode.className.replace(/ ?mouseover$/, ''); };
  }
}