var leftMenu;
var currentNode;
var menuContainingCurrentNode;

window.onload = function () {
    leftMenu = new SlidingMenu("left_menu");
    leftMenu.init();
    leftMenu.speed = 5;                    // Menu sliding speed (1 - 5 recomended)
    leftMenu.remember = true;              // Store menu states (expanded or collapsed) in cookie and restore later
    leftMenu.oneSmOnly = true;             // One expanded submenu at a time
    leftMenu.markCurrent = false;          // Mark current link / page (link.href == location.href)

    rightMenu = new SlidingMenu("right_menu");
    rightMenu.init();
    rightMenu.speed = 5;                    // Menu sliding speed (1 - 5 recomended)
    rightMenu.remember = true;              // Store menu states (expanded or collapsed) in cookie and restore later
    rightMenu.oneSmOnly = true;             // One expanded submenu at a time
    rightMenu.markCurrent = false;          // Mark current link / page (link.href == location.href)

    if (currentNode) {
        if (currentNode.parentNode.className != "rbmenu" && currentNode.parentNode.className == "collapsed") {
            menuContainingCurrentNode.toggleMenu(currentNode.parentNode);
        }
    }
};
	
	function clearMenus() {
		leftMenu.collapseAll();
		rightMenu.collapseAll();
	}

function SlidingMenu(id) {
	if (!document.getElementById || !document.getElementsByTagName)
		return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("div");
	this.remember = true;
	this.speed = 3;
	this.markCurrent = true;
	this.oneSmOnly = true;
}
SlidingMenu.prototype.init = function () {
    var mainInstance = this;
    for (var i = 0; i < this.submenus.length; i++)
        this.submenus[i].getElementsByTagName("span")[0].onclick = function () {
            //this.submenus[i].getElementsByTagName("span")[0].onmouseover = function() {
            mainInstance.toggleMenu(this.parentNode);
        };
    if (this.markCurrent) {
        var links = this.menu.getElementsByTagName("a");
        for (var i = 0; i < links.length; i++)
            if (links[i].href == document.location.href) {
                links[i].className = "current";
                currentNode = links[i];
                menuContainingCurrentNode = this;
                break;
            }
    }
    if (this.remember) {
        var regex = new RegExp("rb_menu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
        var match = regex.exec(document.cookie);
        if (match) {
            var states = match[1].split("");
            for (var i = 0; i < states.length; i++)
                this.submenus[i].className = (states[i] == 0 ? "collapsed" : "");
        }
    }
};
SlidingMenu.prototype.toggleMenu = function(submenu) {
	if (submenu.className == "collapsed")
		this.expandMenu(submenu);
	else
		this.collapseMenu(submenu);
	
	if (submenu.parentNode.id == "left_menu")
	    rightMenu.collapseAll();
	else if (submenu.parentNode.id == "right_menu")
	    leftMenu.collapseAll();
};
SlidingMenu.prototype.expandMenu = function(submenu) {
	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var links = submenu.getElementsByTagName("a");
	for (var i = 0; i < links.length; i++)
		fullHeight += links[i].offsetHeight;
	var moveBy = Math.round(this.speed * links.length);
	
	var mainInstance = this;
	var intId = setInterval(function() {
		var curHeight = submenu.offsetHeight;
		var newHeight = curHeight + moveBy;
		if (newHeight < fullHeight)
			submenu.style.height = newHeight + "px";
		else {
			clearInterval(intId);
			submenu.style.height = "";
			submenu.className = "";
			mainInstance.memorize();
		}
	}, 30);
	this.collapseOthers(submenu);
};
SlidingMenu.prototype.collapseMenu = function(submenu) {
	var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
	var mainInstance = this;
	var intId = setInterval(function() {
		var curHeight = submenu.offsetHeight;
		var newHeight = curHeight - moveBy;
		if (newHeight > minHeight)
			submenu.style.height = newHeight + "px";
		else {
			clearInterval(intId);
			submenu.style.height = "";
			submenu.className = "collapsed";
			mainInstance.memorize();
		}
	}, 30);
};
SlidingMenu.prototype.collapseOthers = function(submenu) {
	if (this.oneSmOnly) {
		for (var i = 0; i < this.submenus.length; i++)
			if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
				this.collapseMenu(this.submenus[i]);
	}
};
SlidingMenu.prototype.expandAll = function() {
	var oldOneSmOnly = this.oneSmOnly;
	this.oneSmOnly = false;
	for (var i = 0; i < this.submenus.length; i++)
		if (this.submenus[i].className == "collapsed")
			this.expandMenu(this.submenus[i]);
	this.oneSmOnly = oldOneSmOnly;
};
SlidingMenu.prototype.collapseAll = function() {
	for (var i = 0; i < this.submenus.length; i++)
		if (this.submenus[i].className != "collapsed")
			this.collapseMenu(this.submenus[i]);
};
SlidingMenu.prototype.memorize = function() {
	if (this.remember) {
		var states = new Array();
		for (var i = 0; i < this.submenus.length; i++)
			states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
		var d = new Date();
		d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
		//commented expire time so state is not stored across visits.
		document.cookie = "rb_menu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + /*"; expires=" + d.toGMTString() +*/ "; path=/";
	}
};