// Title: Main Menu
// Description: Free JavaScript Menu Navigation
// URL: http://www.javascript-menu.com/
// Version: 2.1 (Stein)

// --------------------------------------------------------------------------------
// 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'  : 16,
                'block_left' : 16,
                'top'        : 20,
                'left'       : 4,
                'width'      : 120,
                'height'     : 22,
                '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);
}