// --------------------------------------------------------------------------------

// global collection containing all menus on current page
var A_MENUS = [];



// --------------------------------------------------------------------------------

// menu class
function menu (a_items, a_tpl) {


	// browser check

	if (!document.body || !document.body.style)

		return;


	// store items structure

	this.a_config = a_items;


	// store template structure

	this.a_tpl = a_tpl;


	// get menu id

	this.n_id = A_MENUS.length;


	// declare collections

	this.a_index = [];

	this.a_children = [];


	// assigh methods and event handlers

	this.expand      = menu_expand;

	this.collapse    = menu_collapse;


	this.onclick     = menu_onclick;

	this.onmouseout  = menu_onmouseout;

	this.onmouseover = menu_onmouseover;

	this.onmousedown = menu_onmousedown;


	// default level scope description structure 

	this.a_tpl_def = {


		'block_top'  : 10,

		'block_left' : 87,

		'top'        : 0,

		'left'       : 0,

		'width'      : 170,

		'height'     : 25,

		'hide_delay' : 0,

		'expd_delay' : 0,

		'css'        : {

			'inner' : '',

			'outer' : ''

		}

	};

	

	// assign methods and properties required to imulate parent item

	this.getprop = function (s_key) {


		return this.a_tpl_def[s_key];

	};


	this.o_root = this;

	this.n_depth = -1;

	this.n_x = 0;

	this.n_y = 0;

	// 	init items recursively

	for (n_order = 0; n_order < a_items.length; n_order++)

		new menu_item(this, n_order);


	// register self in global collection

	A_MENUS[this.n_id] = this;


	// make root level visible

	for (var n_order = 0; n_order < this.a_children.length; n_order++)

		this.a_children[n_order].e_oelement.style.visibility = 'visible';

}



// --------------------------------------------------------------------------------

function menu_collapse (n_id) {

	// cancel item open delay

	clearTimeout(this.o_showtimer);


	// by default collapse to root level

	var n_tolevel = (n_id ? this.a_index[n_id].n_depth : 0);

	

	// hide all items over the level specified

	for (n_id = 0; n_id < this.a_index.length; n_id++) {

		var o_curritem = this.a_index[n_id];

		if (o_curritem.n_depth > n_tolevel && o_curritem.b_visible) {

			o_curritem.e_oelement.style.visibility = 'hidden';

			o_curritem.b_visible = false;

		}

	}

	// reset current item if mouse has gone out of items

	if (!n_id)

		this.o_current = null;

}



// --------------------------------------------------------------------------------

function menu_expand (n_id) {

	// expand only when mouse is over some menu item

	if (this.o_hidetimer)

		return;


	// lookup current item

	var o_item = this.a_index[n_id];

	// close previously opened items

	if (this.o_current && this.o_current.n_depth >= o_item.n_depth)

		this.collapse(o_item.n_id);

	this.o_current = o_item;


	// exit if there are no children to open
	if (!o_item.a_children)

		return;


	// show direct child items

	for (var n_order = 0; n_order < o_item.a_children.length; n_order++) {

		var o_curritem = o_item.a_children[n_order];

		o_curritem.e_oelement.style.visibility = 'visible';

		o_curritem.b_visible = true;

	}

}



// --------------------------------------------------------------------------------

function menu_onclick (n_id) {

	var o_item = this.a_index[n_id];

	var s_link = o_item.a_config[1];

	if (!s_link)
		return true;

	if (String(s_link).toLowerCase().indexOf('javascript:') == 0)

		return eval(s_link);

	if (o_item.a_config[2] && o_item.a_config[2]['tw'])

		window.open(s_link, o_item.a_config[2]['tw']);

	else

		window.location = s_link;

	return true;

}



// --------------------------------------------------------------------------------

function menu_onmouseout (n_id) {


	// lookup new item's object	

	var o_item = this.a_index[n_id];


	// apply rollout
	o_item.e_oelement.className = o_item.getstyle(0, 0);

	o_item.e_ielement.className = o_item.getstyle(1, 0);

	

	// update status line	

	o_item.upstatus(7);


	// run mouseover timer

	this.o_hidetimer = setTimeout('A_MENUS['+ this.n_id +'].collapse();',

		o_item.getprop('hide_delay'));

}


// --------------------------------------------------------------------------------

function menu_onmouseover (n_id) {


	// cancel mouseoute menu close and item open delay

	clearTimeout(this.o_hidetimer);

	this.o_hidetimer = null;

	clearTimeout(this.o_showtimer);



	// lookup new item's object	

	var o_item = this.a_index[n_id];


	// update status line	

	o_item.upstatus();


	// apply rollover

	o_item.e_oelement.className = o_item.getstyle(0, 1);

	o_item.e_ielement.className = o_item.getstyle(1, 1);

	
	// if onclick open is set then no more actions required

	if (o_item.getprop('expd_delay') < 0)


		return;


	// run expand timer

	this.o_showtimer = setTimeout('A_MENUS['+ this.n_id +'].expand(' + n_id + ');',

		o_item.getprop('expd_delay'));


}


// --------------------------------------------------------------------------------

// called when mouse button is pressed on menu item

// --------------------------------------------------------------------------------

function menu_onmousedown (n_id) {

	
	
// lookup new item's object	

	var o_item = this.a_index[n_id];


	// apply mouse down style

	o_item.e_oelement.className = o_item.getstyle(0, 2);

	o_item.e_ielement.className = o_item.getstyle(1, 2);

	this.expand(n_id);

}



// --------------------------------------------------------------------------------

// menu item Class

function menu_item (o_parent, n_order) {


	// store parameters passed to the constructor
	this.n_depth  = o_parent.n_depth + 1;

	this.a_config = o_parent.a_config[n_order + (this.n_depth ? 3 : 0)];


	// return if required parameters are missing

	if (!this.a_config) return;


	// store info from parent item
	this.o_root    = o_parent.o_root;

	this.o_parent  = o_parent;

	this.n_order   = n_order;


	// register in global and parent's collections

	this.n_id = this.o_root.a_index.length;

	this.o_root.a_index[this.n_id] = this;

	o_parent.a_children[n_order] = this;



	// calculate item's coordinates

	var o_root = this.o_root,

		a_tpl  = this.o_root.a_tpl;


	// assign methods

	this.getprop  = mitem_getprop;
	this.getstyle = mitem_getstyle;

	this.upstatus = mitem_upstatus;

	this.n_x = n_order

		? o_parent.a_children[n_order - 1].n_x + this.getprop('left')

		: o_parent.n_x + this.getprop('block_left');


	this.n_y = n_order

		? o_parent.a_children[n_order - 1].n_y + this.getprop('top')

		: o_parent.n_y + this.getprop('block_top');


	// generate item's HMTL

	document.write (

		'<div id="e', o_root.n_id, '_',	this.n_id, 'o" class="', this.getstyle(0, 0), '"', 

		(this.a_config[2] && this.a_config[2]['tt'] ? ' title="' + this.a_config[2]['tt'] + '"' : ''),

		' style="position:absolute;top: ', this.n_y, 'px;left:', this.n_x, 'px;width:',

		this.getprop('width'), 'px;height:', this.getprop('height'), 'px;visibility:hidden;',

		' z-index: ', this.n_depth, ';cursor:', (this.a_config[1] ? 'pointer' : 'default'), '" ',

		'onclick="return A_MENUS[', o_root.n_id, '].onclick(', this.n_id,

		');" onmouseout="A_MENUS[', o_root.n_id, '].onmouseout(', this.n_id,

		');" onmouseover="A_MENUS[', o_root.n_id, '].onmouseover(',

		this.n_id, ');" onmousedown="A_MENUS[', o_root.n_id, '].onmousedown(',

		this.n_id, ');"><div id="e', o_root.n_id, '_',

		this.n_id, 'i" class="' ,this.getstyle(1, 0), '">',



		this.a_config[0], "</div></div>"

	);

	this.e_ielement = document.getElementById('e' + o_root.n_id + '_' + this.n_id + 'i');

	this.e_oelement = document.getElementById('e' + o_root.n_id + '_' + this.n_id + 'o');


	this.b_visible = !this.n_depth;


	// no more initialization if leaf

	if (this.a_config.length < 4)

		return;


	// node specific methods and properties

	this.a_children = [];


	// init downline recursively

	for (var n_order = 0; n_order < this.a_config.length - 3; n_order++)

		new menu_item(this, n_order);

}


// --------------------------------------------------------------------------------

// reads property from template file, inherits from parent level if not found

// ------------------------------------------------------------------------------------------

function mitem_getprop (s_key) {


	// check if value is defined for current level

	var s_value = null,

		a_level = this.o_root.a_tpl[this.n_depth];


	// return value if explicitly defined

	if (a_level)

		s_value = a_level[s_key];



	// request recursively from parent levels if not defined

	return (s_value == null ? this.o_parent.getprop(s_key) : s_value);

}

// --------------------------------------------------------------------------------


// reads property from template file, inherits from parent level if not found


// ------------------------------------------------------------------------------------------

function mitem_getstyle (n_pos, n_state) {


	var a_css = this.getprop('css');

	var a_oclass = a_css[n_pos ? 'inner' : 'outer'];


	// same class for all states	

	if (typeof(a_oclass) == 'string')

		return a_oclass;


	// inherit class from previous state if not explicitly defined

	for (var n_currst = n_state; n_currst >= 0; n_currst--)

		if (a_oclass[n_currst])

			return a_oclass[n_currst];

}




// ------------------------------------------------------------------------------------------

// updates status bar message of the browser

// ------------------------------------------------------------------------------------------

function mitem_upstatus (b_clear) {

	window.setTimeout("window.status=unescape('" + (b_clear

		? ''

		: (this.a_config[2] && this.a_config[2]['sb']

			? escape(this.a_config[2]['sb'])

			: escape(this.a_config[0]) + (this.a_config[1]

				? ' ('+ escape(this.a_config[1]) + ')'

				: ''))) + "')", 10);

}


// --------------------------------------------------------------------------------


// that's all folks