var tii_pnav_branch;
var tii_pnav_previousLink;
var tii_pnav_previousLinkTracker;
var tii_pnav_dontResetCurrentLink = false;

function tii_pnav_initializeDropdownMenu(primaryNavId, hideOrShowMenuFunction, changeStateFunction) {
	var isopera = typeof window.opera != 'undefined';
	var isie = typeof document.all != 'undefined' && !isopera && navigator.vendor != 'KDE';
	var issafari = navigator.vendor == 'Apple Computer, Inc.';
	
	if (typeof document.getElementById == 'undefined' || (issafari && typeof window.XMLHttpRequest == 'undefined') || (isie && typeof document.uniqueID == 'undefined')) {
		return;
	}
  
	var tree = document.getElementById (primaryNavId);
	if (tree) {
		tree.focus ();
		tree.blur ();
		
		tii_pnav_branch = tree;
		var items = tree.getElementsByTagName('li');
		for (var i = 0; i < items.length; i++) {
			tii_pnav_setDropdownTrigger (tree, items[i], primaryNavId, isie, hideOrShowMenuFunction, changeStateFunction);
		}
	
		if (!isopera) {
			tii_dom_removeWhitespaceTextNodes (tree);
	
			var keyevent = issafari || isie ? 'keydown' : 'keypress';
			tii_addEventHandler(document, keyevent, function(e) {
				var target = typeof e.target != 'undefined' ? e.target : e.srcElement;
				if (tree.contains(target) && target.getAttribute('href')) {
					/*
					keycode 27 = escape key
					37 = left arrow key
					38 = up arrow key
					39 = right arrow key
					40 = down arrow key
					*/
					if (/^(27|37|38|39|40)$/.test(e.keyCode.toString())) {
						tii_pnav_setArrowKeyNavigation(tree, target, e.keyCode, isie, hideOrShowMenuFunction, changeStateFunction);
					
						if (typeof e.preventDefault != 'undefined') {
							e.preventDefault();
						}
						return false;
					}
				}
				return true;
			}, false);
		}
		
		if (!isie) {
			tree.contains = function (node) {
				return (node != null && (node == this || this.contains(node.parentNode)));
			};
		}
	}
}

function tii_pnav_setDropdownTrigger (tree, li, navid, isie, hideOrShowMenuFunction, changeStateFunction) {
	var opentime, closetime;
	var a = li.getElementsByTagName('a')[0];
	var menu = li.getElementsByTagName('ul').length > 0 ? li.getElementsByTagName('ul')[0] : (li.parentNode.parentNode.id == navid ? li : null);
	var issub = li.parentNode.id == navid;
	/*
	tii_addEventHandler(window, 'load', function() {
		if (isie) {
			window.clearFocus = true;
			var clearAnchor = tree.getElementsByTagName('a').item (1);
			clearAnchor.focus ();
		}
	}, false);
	*/
	
	tii_addEventHandler(a, 'focus', function(e) {
		clearTimeout(closetime);
		tii_pnav_resetPreviousLink (a, isie, hideOrShowMenuFunction, changeStateFunction);
		if (menu) {
			changeStateFunction.call (this, a.parentNode, false, 2);
			tii_pnav_makeMenuVisible (menu, issub, li, a, isie, hideOrShowMenuFunction, changeStateFunction);
		}
		else {
			var liGrandPar = li.parentNode.parentNode;
			changeStateFunction.call (this, a.parentNode, true, 2);
			changeStateFunction.call (this, liGrandPar, false, 1);
			var currentLi = a.parentNode;
			var currentPrimaryLi = tii_pnav_getPrimaryLi (a);
			var currentUl = currentLi.parentNode;
			var currentPrimaryA = currentPrimaryLi.firstChild;
			if (currentLi != currentPrimaryLi && currentUl.className == '') {
				tii_pnav_makeMenuVisible (currentUl, issub, currentPrimaryLi, currentPrimaryA, isie, hideOrShowMenuFunction, changeStateFunction);
				changeStateFunction.call (this, currentPrimaryLi, false, 1);
			}
		}
		/*	
		if (isie && window.clearFocus) {
				window.clearFocus = false;
				tii_pnav_resetCurrentLink (a, hideOrShowMenuFunction, changeStateFunction);
				a.blur ();
			} 
		*/
	}, false);

	tii_addEventHandler(a, 'blur', function(e) {
		if (a.className.indexOf ('lastpnitem') > -1 && tii_pnav_previousLinkTracker != null && tii_pnav_previousLinkTracker.className.indexOf ('lastpnitem') < 0) {
			if (!tii_pnav_dontResetCurrentLink) {
				tii_pnav_resetCurrentLink(a, hideOrShowMenuFunction, changeStateFunction);
			}
		}
	}, false);
  
	tii_addEventHandler(li, 'mouseover', function(e) {
		if (tii_pnav_isUnwantedTextEvent ()) { 
			return; 
		}
		clearTimeout(closetime);
		if (tii_pnav_branch == li) {
			tii_pnav_branch = null;
		}
	
		var target = typeof e.target != 'undefined' ? e.target : window.event.srcElement;
		while (target.nodeName.toUpperCase() != 'LI') {
			target = target.parentNode;
		}
		if (target != li) {
			return;
		}
	
		tii_pnav_resetPreviousLink (a, isie, hideOrShowMenuFunction, changeStateFunction);
	
		if (menu) {
			changeStateFunction.call (this, a.parentNode, false, 2);
			opentime = window.setTimeout(function() {
				tii_pnav_makeMenuVisible (menu, issub, li, a, isie, hideOrShowMenuFunction, changeStateFunction);
			}, 1);
		}
		else {
			changeStateFunction.call (this, li.parentNode.parentNode, false, 1);
		}
	}, false);

	tii_addEventHandler(li, 'mouseout', function(e) {
		if (tii_pnav_isUnwantedTextEvent ()) {
			return;
		}
		
		var related = typeof e.relatedTarget != 'undefined' ? e.relatedTarget : window.event.toElement;
		if (!li.contains(related)) {
			clearTimeout (opentime);
			tii_pnav_branch = li;
			if (menu) {
				changeStateFunction.call (this, a.parentNode, false, 0);
				closetime = window.setTimeout (function () {
					tii_pnav_resetCurrentLink (a, hideOrShowMenuFunction, changeStateFunction);
				}, 1);
			}
			else {
				changeStateFunction.call (this, a.parentNode, true, 0);
			}	  
		}
	}, false);

	if (!isie) {
		li.contains = function(node) {
			return (node != null && (node == this || this.contains(node.parentNode)));
		};
	}
}

function tii_pnav_setArrowKeyNavigation (tree, link, keycode, isie, hideOrShowMenuFunction, changeStateFunction) {
	var currentPrimaryLi = tii_pnav_getPrimaryLi (link);
	var openClosedPrimary = false;
	
	if (link.parentNode != currentPrimaryLi && link.parentNode.parentNode.className == '') {
		link = currentPrimaryLi.firstChild;
		openClosedPrimary = true;
	}

	var li = link.parentNode;
	var menu = li.getElementsByTagName('ul').length > 0 ? li.getElementsByTagName('ul')[0] : null;
	var parent = li.parentNode;
	var isTopLevel = parent.parentNode == tree;

	changeStateFunction.call(this, li, !menu, 0);
	tii_pnav_dontResetCurrentLink = (link.className.indexOf ('lastpnitem') > -1);
  
	switch (keycode) {
		case 27:
			tii_pnav_dontResetCurrentLink = false;
			tii_pnav_resetCurrentLink (link, hideOrShowMenuFunction, changeStateFunction);
			break;
		
		case 37:
			tii_pnav_moveToPrevious((menu || isTopLevel) ? li : parent.parentNode);
			break;
		
		case 38:
			if (menu || isTopLevel) {
				changeStateFunction.call (this, link.parentNode, false, 2);
			}
			else {
				if (li == li.parentNode.firstChild) {
					parent.parentNode.firstChild.focus ();
				}
				else {
					tii_pnav_moveToPrevious (li);
				}
			}
			break;
		
		case 39:
			tii_pnav_moveToNext((menu || isTopLevel) ? li : parent.parentNode);
			break;
		
		case 40:
			tii_pnav_dontResetCurrentLink = false;
			if (menu && openClosedPrimary) {
				openClosedPrimary = false;
				menu.parentNode.firstChild.focus ();
			}
			if (menu || isTopLevel) {
				menu.firstChild.firstChild.focus ();
			}
			else {
				tii_pnav_moveToNext (li);
			}
			break;
	}  
}

function tii_pnav_makeMenuVisible (menu, issub, li, a, isie, hideOrShowMenuFunction, changeStateFunction) {
	if (typeof li.offsetLeft == 'undefined') {
		return;
	}
	changeStateFunction.call(this, a.parentNode, false, 2);
	hideOrShowMenuFunction(menu, false, li);
	menu.style.top = a.offsetHeight + 'px';
}

function tii_pnav_resetPreviousLink (a, isie, hideOrShowMenuFunction, changeStateFunction) {
	if (tii_pnav_previousLink) {
		var prevLi = tii_pnav_previousLink.parentNode;
		var currentLi = a.parentNode;
		var prevPrimaryLi = tii_pnav_getPrimaryLi (tii_pnav_previousLink);
		var currentPrimaryLi = tii_pnav_getPrimaryLi (a);
		
		if (prevLi != prevPrimaryLi) {
			changeStateFunction.call (this, prevLi, true, 0);
		}
		
		var hideMenu = prevPrimaryLi != currentPrimaryLi || a == null;
		
		if (hideMenu || (prevLi != prevPrimaryLi && currentLi == currentPrimaryLi)) {
			changeStateFunction.call (this, prevPrimaryLi, false, 0);
			if (hideMenu) {
				var ul = prevPrimaryLi.getElementsByTagName('ul').item (0);
				if (ul) {
					hideOrShowMenuFunction (ul, true, null);
				}
			}
		}
	}
	tii_pnav_previousLinkTracker = tii_pnav_previousLink;
	tii_pnav_previousLink = a;
}

function tii_pnav_resetCurrentLink(a, hideOrShowMenuFunction, changeStateFunction) {
	var currentLi = a.parentNode;
	var currentPrimaryLi = tii_pnav_getPrimaryLi (a);
	changeStateFunction.call (this, currentPrimaryLi, false, 0);
	if (currentLi != currentPrimaryLi) {
		changeStateFunction.call (this, currentLi, true, 0);
	}
	
	var ul = currentPrimaryLi.getElementsByTagName('ul').item (0);
	if (ul) {
        closetime = window.setTimeout(function() {
			hideOrShowMenuFunction (ul, true, null);
		}, 1);
	}
}

function tii_pnav_getPrimaryLi(a) {
	return ((a.parentNode.parentNode.parentNode.nodeName.toUpperCase ()== 'DIV') ? a.parentNode : a.parentNode.parentNode.parentNode);
}

function tii_pnav_moveToPrevious(li) {
	var previous = li.previousSibling;
	if (!previous) {
		previous = li.parentNode.childNodes[li.parentNode.childNodes.length - 1];
	}
	previous.firstChild.focus();
}

function tii_pnav_moveToNext(li) {
	var next = li.nextSibling;
	if (!next) {
		next = li.parentNode.childNodes.item (0);
	}
	next.firstChild.focus();
};

function tii_pnav_isUnwantedTextEvent() {
  return (navigator.vendor == 'Apple Computer, Inc.' && (event.target == event.relatedTarget.parentNode || (event.eventPhase == 3 && event.target.parentNode == event.relatedTarget)));
}