window.onload = function ( event ) {
  if ( document.all && document.getElementById ) {
    var navRoot = document.getElementById( 'menu2' );
    for ( var i = 0; i < navRoot.childNodes.length; i++ ) {
      var node = navRoot.childNodes[ i ];
      if ( node.nodeName == 'LI') {
        node.onmouseover = function ( event ) { this.className += ' over'; };
        node.onmouseout  = function ( event ) { this.className = this.className.replace( ' over', '' ); };
      }
    }
  }
};