var MENUDIV_ID = "dhtmlgoodies_menu";
var SUBMENU_CLASS = 'dhtmlgoodies_subMenu';
var menuItems;
var slideSpeed_out = 10;        // Steps to move sub menu at a time ( higher = faster)
var slideSpeed_in = 10;
var delayMenuClose = 150;        // Microseconds from mouseout to close of menu
var slideTimeout_out = 25;        // Microseconds between slide steps ( lower = faster)
var slideTimeout_in = 10;        // Microseconds between slide steps ( lower = faster)
var xOffsetSubMenu = 0;         // Offset x-position of sub menu items - use negative value if you want the sub menu to overlap main menu

/* Don't change anything below here */

var indeces = new Array();
indeces[0] = 0;
var isMSIE = navigator.userAgent.indexOf('MSIE')>=0?true:false;
var browserVersion = parseInt(navigator.userAgent.replace(/.*?MSIE ([0-9]+?)[^0-9].*/g,'$1'));
if(!browserVersion)browserVersion=1;

function mouseOn(obj) {
        var mi = findNode(getSearchIdFromObj(obj));
        if (mi) mi.mouseOn();
}

function mouseOff(obj) {
        var mi = findNode(getSearchIdFromObj(obj));
        if (mi) mi.mouseOff();
}

function getSearchIdFromObj(obj) {
        // pull the postfix off the A link or LI tag id and return the menu item ID
        var objId = obj.id;
        var idx = objId.indexOf('_');
        if (idx>=0) {
                return "MenuItem" + objId.substring(idx);
        }
        return null;
}

function slideChildMenu(aId) {
        var mi = findNode(aId);
        if (mi) mi.slideChildMenu();
}

function findNode(searchId) {
        var result;
        for (var no=0;no<menuItems.length;no++) {
                result = menuItems[no].findNode(searchId);
                if (result) return result;
        }
        return null;
}

function getNextIndex(lvl) {
        var result = 0;
        if (indeces.length<=lvl) {
                indeces[lvl] = 1;
        } else {
                result = indeces[lvl];
                indeces[lvl]++;
        }
        return result;
}

function MenuItem(divref, ulref, liref, lvlnum, parentref) {
        this.parent = parentref;
        this.div = divref;
        this.ul = ulref;
        this.width = this.ul.offsetWidth;
        // this.left = div.style.left.replace(/[^0-9]/g,'');
        this.li = liref;
        this.alink = this.li.getElementsByTagName('A')[0];
        this.lvl = lvlnum;
        this.idx = getNextIndex(this.lvl);
        this.children;
        this.subUL = this.li.getElementsByTagName('UL')[0];
        this.children;
        this.isMouseOnMe = false;
        // note: if !isOpen && !isClosed then I am animating a slide
        this.isChildMenuOpen = false;
        this.isChildMenuClosed = true;

        // Constructor
        // if a node does not have an A tag but it's children do then we need
        // null out this node's alink field...
        if (this.alink) {
                if (this.alink.parentNode!=this.li) this.alink = null;
        }
        if (this.subUL) {
                this.children = new Array();
                var subLI = this.subUL.getElementsByTagName('LI')[0];
                while(subLI) {
                        if(subLI.tagName && subLI.tagName.toLowerCase()=='li') {
                                this.children[this.children.length] = new MenuItem(null, this.subUL, subLI, this.lvl + 1, this);
                        }
                        subLI = subLI.nextSibling;
                }
        }

        this.getPostfix = function() {
                return '_' + this.idx + '_' + this.lvl;
        }

        this.getId = function() {
                return "MenuItem" + this.getPostfix();
        }

        this.hasChildren = function() {
                return (this.children!=null);
        }

        this.getTopPos = function() {
                var origDisp = this.div.style.display;
                this.div.style.display = "";
                var obj = this.li;
                var result = obj.offsetTop;
                while((obj = obj.offsetParent) != null) result += obj.offsetTop;
                this.div.style.display = origDisp;
                return result;
        }

        this.getLeftPos = function() {
                var origDisp = this.div.style.display;
                this.div.style.display = "";
                var obj = this.li;
                var result = obj.offsetLeft;
                while((obj = obj.offsetParent) != null) result += obj.offsetLeft;
                this.div.style.display = origDisp;
                return result;
        }

        this.renderNode = function() {
                // set node properties
                this.li.id = "menuItemLI" + this.getPostfix();
                this.ul.style.position = "relative";
                if (this.alink) {
                        this.alink.id = "menuItemA" + this.getPostfix();
                        this.alink.onmouseover = function() {mouseOn(this);};
                        this.alink.onmouseout = function() {mouseOff(this);};
                } else {
                        this.li.onmouseover = function() {mouseOn(this);};
                        this.li.onmouseout = function() {mouseOff(this);};
                }

                // set sub-menu nodes
                if (this.hasChildren()) {
                        var mi = this.children[0];
                        var subdiv = document.createElement('DIV');
                        subdiv.className=SUBMENU_CLASS;
                        document.body.appendChild(subdiv);
                        subdiv.id = "menuItemDIV" + mi.getPostfix();
                        this.subUL.id = "menuItemUL" + mi.getPostfix();
                        subdiv.appendChild(this.subUL);
                        subdiv.style.left = this.getLeftPos() + this.width + xOffsetSubMenu + 'px';
                        subdiv.style.top = this.getTopPos() + 'px';
                        subdiv.style.visibility = "hidden";
                        subdiv.style.display = "none";
                        subdiv.style.zindex = "1000";
                        for (var no=0;no<this.children.length;no++) {
                                var mi = this.children[no];
                                mi.div = subdiv;
                                mi.renderNode();
                        }
                }
                return this.li;
        }

        this.findNode = function(searchId) {
                var result;
                if (this.getId() == searchId) {
                        result = this;
                } else {
                        if (this.hasChildren()) {
                                for (var no=0;no<this.children.length;no++) {
                                        var mi = this.children[no];
                                        result = mi.findNode(searchId);
                                        if (result!=null) break;
                                }
                        }
                }
                return result;
        }

        this.mouseOn = function() {
                this.isMouseOnMe = true;
                if (this.hasChildren() && this.isChildMenuClosed) {
                        this.initiateChildMenuOpen();
                }
        }

        this.mouseOff = function() {
                this.isMouseOnMe = false;
                if (this.hasChildren() && !this.isChildMenuClosed) {
                        this.initiateChildMenuClose();
                } else if (this.parent) {
                        this.parent.mouseOff();
                }
        }

        this.isMouseOnChild = function() {
                if (this.isMouseOnMe) return true;
                if (this.hasChildren()) {
                        for (var no=0;no<this.children.length;no++) {
                                if (this.children[no].isMouseOnChild()) return true;
                        }
                }
                return false;
        }

        this.initiateChildMenuOpen = function() {
                this.isChildMenuClosed = false;
                var childDiv = this.children[0].div;
                childDiv.style.width = "0px";
                childDiv.style.visibility = "visible";
                childDiv.style.display = "";
                this.slideChildMenu();
        }

        this.initiateChildMenuClose = function() {
                this.isChildMenuOpen = false;
                // we have to wait to close the menu
                // allow the mouse to navigate over the child menu
                setTimeout("slideChildMenu('" + this.getId() + "')", delayMenuClose);
        }

        this.slideChildMenu = function() {
                var divref = this.children[0].div;
                var ulref = this.children[0].ul;
                var maxwidth = this.children[0].width;
                var nextWidth;
                if (this.isMouseOnMe  || this.isMouseOnChild()) {
                        nextWidth = divref.offsetWidth + slideSpeed_out;
                        if (nextWidth >= maxwidth) {
                                this.finishOpeningChild(divref, ulref, maxwidth);
                        } else {
                                ulref.style.left = nextWidth - maxwidth + "px";
                                divref.style.width = nextWidth + "px";
                                setTimeout("slideChildMenu('" + this.getId() + "')", slideTimeout_out);
                        }
                } else {
                        nextWidth = divref.offsetWidth - slideSpeed_in;
                        if (nextWidth <= 0) {
                                this.finishClosingChild(divref, ulref, maxwidth);
                        } else {
                                ulref.style.left = nextWidth - maxwidth + "px";
                                divref.style.width = nextWidth + "px";
                                setTimeout("slideChildMenu('" + this.getId() + "')", slideTimeout_out);
                        }
                }
        }

        this.finishOpeningChild = function(divref, ulref, maxwidth) {
                this.isChildMenuOpen = true;
                this.isChildMenuClosed = false;
                ulref.style.left = "0px";
                divref.style.width = maxwidth + "px";
        }

        this.finishClosingChild = function(divref, ulref, maxwidth) {
                this.isChildMenuOpen = false;
                this.isChildMenuClosed = true;
                divref.style.visibility = "hidden";
                divref.style.display = "none";
                divref.style.width = maxwidth + "px";
                if (this.parent) this.parent.mouseOff();
        }

}

function collectMenuNodes(menuObj) {
     if (!menuObj) return null;

     var results = new Array();
     var menuUL = menuObj.getElementsByTagName('UL')[0];
     var menuLI = menuUL.getElementsByTagName('LI')[0];
     while(menuLI) {
        if(menuLI.tagName && menuLI.tagName.toLowerCase()=='li') {
              results[results.length] = new MenuItem(menuObj, menuUL, menuLI, 0, null);
        }
        menuLI = menuLI.nextSibling;
     }
     return results;
}

function initMenu() {
        var mainDiv = document.getElementById(MENUDIV_ID);
        menuItems = collectMenuNodes(mainDiv);
        if (menuItems) {
                for (var no=0;no<menuItems.length;no++) {
                        var mi = menuItems[no];
                        mi.renderNode();
                }
                mainDiv.style.visibility = 'visible';
        }
        // window.onresize = resetPosition;
}

window.onload = initMenu;