var menus = [];

// --- menu class ---
function menu (item_struct, pos, styles) {
  // browser check
  this.item_struct = item_struct;
  this.pos = pos;
  this.styles = styles;
  this.id = menus.length;
  this.items = [];
  this.children = [];
	
  this.add_item = menu_add_item;
  this.hide = menu_hide;
	
  this.onclick = menu_onclick;
  this.onmouseout = menu_onmouseout;
  this.onmouseover = menu_onmouseover;
  this.onmousedown = menu_onmousedown;
	
  var i;
  for (i = 0; i < this.item_struct.length; i++)
    new menu_item(i, this, this);
  for (i = 0; i < this.children.length; i++)
    this.children[i].visibility(true);
  menus[this.id] = this;
}

function menu_add_item (item) {
  var id = this.items.length;
  this.items[id] = item;
  return (id);
}

function menu_hide () {
  for (var i = 0; i < this.items.length; i++) {
    this.items[i].visibility(false);
    this.items[i].switch_style('onmouseout');
  }
}

function menu_onclick (id) {
  var item = this.items[id];
  return (item.fields[1] ? true : false);
}

function menu_onmouseout (id) {
  this.hide_timer = setTimeout('menus['+ this.id +'].hide();',
    this.pos['hide_delay'][this.active_item.depth]);
  if (this.active_item.id == id)
    this.active_item = null;
}

function menu_onmouseover (id) {
  this.active_item = this.items[id];
  clearTimeout(this.hide_timer);
  var curr_item, visib;
  for (var i = 0; i < this.items.length; i++) {
    curr_item = this.items[i];
    visib = (curr_item.arrpath.slice(0, curr_item.depth).join('_') ==
      this.active_item.arrpath.slice(0, curr_item.depth).join('_'));
    if (visib)
      curr_item.switch_style (
        curr_item == this.active_item ? 'onmouseover' : 'onmouseout');
    curr_item.visibility(visib);
  }
}

function menu_onmousedown (id) {
  this.items[id].switch_style('onmousedown');
}

// --- menu item Class ---
function menu_item (path, parent, container) {
  this.path = new String (path);
  this.parent = parent;
  this.container = container;
  this.arrpath = this.path.split('_');
  this.depth = this.arrpath.length - 1;
  // get pointer to item's data in the structure
  var struct_path = '', i;
  for (i = 0; i <= this.depth; i++)
    struct_path += '[' + (Number(this.arrpath[i]) + (i ? 2 : 0)) + ']';
  eval('this.fields = this.container.item_struct' + struct_path);
  if (!this.fields) return;
	
  // assign methods	
  this.get_x = mitem_get_x;
  this.get_y = mitem_get_y;
  // these methods may be different for different browsers (i.e. non DOM compatible)
  this.init = mitem_init;
  this.visibility = mitem_visibility;
  this.switch_style = mitem_switch_style;
	
  // register in the collections
  this.id = this.container.add_item(this);
  parent.children[parent.children.length] = this;
	
  // init recursively
  this.init();
  this.children = [];
  var child_count = this.fields.length - 2;
  for (i = 0; i < child_count; i++)
    new menu_item (this.path + '_' + i, this, this.container);
  this.switch_style('onmouseout');
}

function mitem_init() {
  document.write (
    '<a id="mi_' + this.container.id + '_'
      + this.id +'" class="m' + this.container.id + 'l' + this.depth 
    +'o" href= " ' + this.fields[1] + '" style="position: absolute; top: '
    + this.get_y() + 'px; left: '	+ this.get_x() + 'px; width: '
    + this.container.pos['width'][this.depth] + 'px; height: '
    + this.container.pos['height'][this.depth] + 'px; visibility: hidden;'
    +' background: black; color: white; z-index: ' + this.depth + ';" '
    + 'onclick="return menus[' + this.container.id + '].onclick('
    + this.id + ');" onmouseout="menus[' + this.container.id + '].onmouseout('
    + this.id + ');" onmouseover="menus[' + this.container.id + '].onmouseover('
    + this.id + ');" onmousedown="menus[' + this.container.id + '].onmousedown('
    + this.id + ');"><div class="m'  + this.container.id + 'l' + this.depth + 'i">'
    + this.fields[0] + "</div></a>\n"
    );
  this.element = document.getElementById('mi_' + this.container.id + '_' + this.id);
}

function mitem_visibility(make_visible) {
  if (make_visible != null) {
    if (this.visible == make_visible) return;
    this.visible = make_visible;
    if (make_visible)
      this.element.style.visibility = 'visible';
    else if (this.depth)
      this.element.style.visibility = 'hidden';
  }
  return (this.visible);
}

function mitem_get_x() {
  var value = 0;
  for (var i = 0; i <= this.depth; i++)
    value += this.container.pos['block_left'][i]
    + this.arrpath[i] * this.container.pos['left'][i];
  return (value);
}

function mitem_get_y() {
  var value = 0;
  for (var i = 0; i <= this.depth; i++)
    value += this.container.pos['block_top'][i]
      + this.arrpath[i] * this.container.pos['top'][i];
  return (value);
}

function mitem_switch_style(state) {
  if (this.state == state) return;
  this.state = state;
  var style = this.container.styles[state];
  for (var i = 0; i < style.length; i += 2)
    if (style[i] && style[i+1])
      eval('this.element.style.' + style[i] + "='" 
        + style[i+1][this.depth] + "';");
}