//------------------------------------
//  retrieve target for event
//------------------------------------

function getTarget(e) {
	var target;
	if (e.target) target = e.target;
	else if (e.srcElement) target = e.srcElement;
	if (target.nodeType == 3) // defeat Safari bug
		target = target.parentNode;

	return target;
}

//------------------------------------
//  retrieve related target for event
//------------------------------------

function getRelatedTarget(e) {
	return (e.relatedTarget) ? e.relatedTarget : e.toElement;
}

function addListener(obj, event, handler) {
	if (obj.addEventListener) {
		obj.addEventListener(event, handler, false);
	} else if (obj.attachEvent) {
		obj.attachEvent('on' + event, handler);
	} else {
		window.status = 'Please upgrade to more recent browser like ie6.0 or firefox.';
	}
}

function addStyleSheet(title, href) {
	var head = document.getElementsByTagName('head')[0];
	var link = document.createElement('link')
	link.rel = 'stylesheet';
	link.type = 'text/css';
	link.title = '';
	link.href = href;
	
	head.appendChild(link);
}

// load our stylesheet
addStyleSheet('menu.horizontal', 'css/menu.css');

// register onload init
addListener(window, 'load', addBehavior);

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

function addBehavior() {
	// get menu roots
	var node;
	var i = 0;
	var k = 1;
	while((node = document.getElementsByTagName('UL').item(i++))) {
		if (node.className == 'hmenu') {
			for (var j = 0; j < node.childNodes.length;j++) {
				if (node.childNodes[j].tagName == 'LI')
					initMenuItem(node.childNodes[j], k++);
			}
		}
	}
}

function initMenuItem(li, num) {
	// to emulate :first-child
	if (num == 1) {
		li.style.borderTopWidth = '1px';
		li.style.borderLeftWidth = '1px';
	}

	for (var i = 0; i < li.childNodes.length;i++) {
		if (li.childNodes[i].tagName == 'UL') {
			var nodeUL = li.childNodes[i];
			li.cachedUL = nodeUL;
			// 1 + n-level submenu
			if (li.parentNode.className != 'hmenu') {
				// background arrow
				li.style.backgroundRepeat = 'no-repeat';
				li.style.backgroundImage = 'url("css/images/sub2.gif")';
				//li.style.backgroundColor = '#3b4a56';
				li.style.backgroundPosition = '99%';
			}
			addListener(li, 'mouseover', showSubmenu);
			addListener(li, 'mouseout',  hideSubmenu);

			var k = 1;
			for (var j = 0; j < nodeUL.childNodes.length;j++) {
				if (nodeUL.childNodes[j].tagName == 'LI')
					initMenuItem(nodeUL.childNodes[j], k++);
			}
		}
	}
}

function showSubmenu(e) {
	if (!e) var e = window.event;
	var target = getTarget(e);
	if (target.tagName == 'A')
		target = target.parentNode;
	if (target.cachedUL) {
		target.cachedUL.style.display = 'block';
	}
}

function hideSubmenu(e) {
	if (!e) var e = window.event;
	var target = getTarget(e);
	var related = getRelatedTarget(e);
	if (!related || related.tagName == 'HTML')
		related = document.getElementsByTagName('body')[0];

	// maybe mouse left only into successor, handle
	if (target.tagName == 'A')
		target = target.parentNode;
	if (isAncestor(target, related))
		return;
	// it left into ancestor
	// find ul upon related node or body
	var commonUL = related;
	while (commonUL.tagName != 'UL' && commonUL.tagName != 'BODY')
		commonUL = commonUL.parentNode;
	// iterate up the tree from target till commonUL and close submenu
	while (target != commonUL && target.tagName != 'BODY') {
		if (target.cachedUL)
			target.cachedUL.style.display = 'none';
		target = target.parentNode;
	}
}

function isAncestor(ancestor, child) {
	while (child != ancestor && child.nodeName != 'BODY')
		child = child.parentNode;
	return child == ancestor ? 1 : 0;
}

function toggleSection(name) {
  if (document.getElementById(name).style.display == 'none') {
    document.getElementById(name).style.display = 'block';
    document.getElementById(name+'_link').innerHTML = '(show less)';
  }
  else {
    document.getElementById(name).style.display = 'none';
    document.getElementById(name+'_link').innerHTML = '(show more)';
  }
}

function showDay(day) {
  var tables = document.getElementsByTagName('div');
  for (var i=0; i<tables.length; i++) {
    if (tables[i].id == day) {
      tables[i].style.display = '';
    }
    else if (tables[i].id.indexOf('day') > 0) {
      tables[i].style.display = 'none';
    }
  }
  var links = document.getElementsByTagName('a');
  for (var i=0; i<links.length; i++) {
    if (links[i].id == day+'_link') {
      links[i].style.color = '#000';
      links[i].style.textDecoration = 'none';
    }
    else if (links[i].id.indexOf('_link') > 0) {
      links[i].style.color = '#00F';
      links[i].style.textDecoration = 'underline';
    }
  }
  var tmpLoc = document.location + '';;
  document.location = tmpLoc.substr(0, tmpLoc.indexOf('#')) + '#' + day.substr(0, day.indexOf('day'));
}

function goBack() {
  if (history.length > 1) {
    if (window.back) {
      window.back();
    }
    else if (history.back) {
      history.back();
    }
    else {
      document.location = 'agenda.php';
    }
  }
  else {
    document.location = 'agenda.php';
  }
}

function hideEm(section) {
  var divs = document.getElementsByTagName('div');
  for (var i=0; i<divs.length; i++) {
    if (divs[i].id.indexOf('_section') > 1) {
      if (divs[i].id == section) {
        divs[i].style.display = 'block';
      }
      else {
        divs[i].style.display = 'none';
      }
    }
  }
}