function cambiarCapaVersiones(capa){
	switch(capa){
		case 'capa0':	document.getElementById('capa0').style.display='block';
						document.getElementById('capa1').style.display='none';
						document.getElementById('capa2').style.display='none';
						break;

		case 'capa1':	document.getElementById('capa0').style.display='none';
						document.getElementById('capa1').style.display='block';
						document.getElementById('capa2').style.display='none';
						break;

		case 'capa2':	document.getElementById('capa0').style.display='none';
						document.getElementById('capa1').style.display='none';
						document.getElementById('capa2').style.display='block';
						break;
	}
}


function mostrarVentajas(){
	if (document.getElementById('masVentajas').style.display=='none')
		document.getElementById('masVentajas').style.display='block';
	else
		document.getElementById('masVentajas').style.display='none';
}
/********************************************************************************************************************/
/*							FUNCIONES PARA EL MENU DESPLEGABLE														*/
/********************************************************************************************************************/
function Browser()
{
	var ua, s, i;
	this.isIE    = false;
	this.isNS    = false;
	this.version = null;

	ua = navigator.userAgent;

	s = "MSIE";
	if ((i = ua.indexOf(s)) >= 0)
	{
    	this.isIE = true;
	    this.version = parseFloat(ua.substr(i + s.length));
    	return;
	}

	s = "Netscape6/";
  	if ((i = ua.indexOf(s)) >= 0)
	{
    	this.isNS = true;
	    this.version = parseFloat(ua.substr(i + s.length));
    	return;
  	}

	// Treat any other "Gecko" browser as NS 6.1.

	s = "Gecko";
  	if ((i = ua.indexOf(s)) >= 0)
	{
    	this.isNS = true;
    	this.version = 6.1;
    	return;
  	}
}

var browser = new Browser();

//----------------------------------------------------------------------------
// Code for handling the menu bar and active button.
//----------------------------------------------------------------------------

var activeButton = null;

// Capture mouse clicks on the page so any active button can be
// deactivated.

if (browser.isIE) document.onmousedown = pageMousedown;
else document.addEventListener("mousedown", pageMousedown, true);

function pageMousedown(event)
{
	var el;
  	if (activeButton == null) return;

	if (browser.isIE) el = window.event.srcElement;
  	else el = (event.target.tagName ? event.target : event.target.parentNode);

	if (el == activeButton) return;

	if (getContainerWith(el, "DIV", "menu") == null)
	{
    	resetButton(activeButton);
    	activeButton = null;
  	}
}

function buttonClick(event, menuId)
{
	var button;

	if (browser.isIE) button = window.event.srcElement;
  	else button = event.currentTarget;

	button.blur();

	if (button.menu == null)
	{
    	button.menu = document.getElementById(menuId);
    	menuInit(button.menu);
  	}

	if (activeButton != null) resetButton(activeButton);

  	if (button != activeButton)
	{
    	depressButton(button);
	    activeButton = button;
  	}
  	else activeButton = null;

	return false;
}

function buttonMouseover(event, menuId)
{
	var button;
	if (browser.isIE)	button = window.event.srcElement;
	else	button = event.currentTarget;

	if (activeButton != null && activeButton != button) buttonClick(event, menuId);
}

function depressButton(button)
{
  var x, y;

  button.className += " menuButtonActive";

  x = getPageOffsetLeft(button);
  y = getPageOffsetTop(button) + button.offsetHeight;

  if (browser.isIE) {
    x += button.offsetParent.clientLeft;
    y += button.offsetParent.clientTop;
  }

  button.menu.style.left = x + "px";
  button.menu.style.top  = y + "px";
  button.menu.style.visibility = "visible";
}

function resetButton(button)
{
  removeClassName(button, "menuButtonActive");

  if (button.menu != null)
  {
    closeSubMenu(button.menu);
    button.menu.style.visibility = "hidden";
  }
}


function menuMouseover(event)
{
  var menu;
  if (browser.isIE) menu = getContainerWith(window.event.srcElement, "DIV", "menu");
  else menu = event.currentTarget;

  if (menu.activeItem != null) closeSubMenu(menu);
}

function menuItemMouseover(event, menuId)
{
  var item, menu, x, y;
  if (browser.isIE) item = getContainerWith(window.event.srcElement, "A", "menuItem");
  else item = event.currentTarget;
  menu = getContainerWith(item, "DIV", "menu");

  if (menu.activeItem != null) closeSubMenu(menu);
  menu.activeItem = item;

  item.className += " menuItemHighlight";

  if (item.subMenu == null)
  {
    item.subMenu = document.getElementById(menuId);
    menuInit(item.subMenu);
  }

  x = getPageOffsetLeft(item) + item.offsetWidth;
  y = getPageOffsetTop(item);

  var maxX, maxY;

  if (browser.isNS)
  {
    maxX = window.scrollX + window.innerWidth;
    maxY = window.scrollY + window.innerHeight;
  }

  if (browser.isIE && browser.version < 6)
  {
    maxX = document.body.scrollLeft + document.body.clientWidth;
    maxY = document.body.scrollTop  + document.body.clientHeight;
  }

  if (browser.isIE && browser.version >= 6)
  {
    maxX = document.documentElement.scrollLeft + document.documentElement.clientWidth;
    maxY = document.documentElement.scrollTop  + document.documentElement.clientHeight;
  }
  maxX -= item.subMenu.offsetWidth;
  maxY -= item.subMenu.offsetHeight;

  if (x > maxX) x = Math.max(0, x - item.offsetWidth - item.subMenu.offsetWidth + (menu.offsetWidth - item.offsetWidth));
  y = Math.max(0, Math.min(y, maxY));

  item.subMenu.style.left = x + "px";
  item.subMenu.style.top  = y + "px";
  item.subMenu.style.visibility = "visible";

  if (browser.isIE) window.event.cancelBubble = true;
  else event.stopPropagation();
}

function closeSubMenu(menu)
{
  if (menu == null || menu.activeItem == null) return;

  if (menu.activeItem.subMenu != null)
  {
    closeSubMenu(menu.activeItem.subMenu);
    menu.activeItem.subMenu.style.visibility = "hidden";
    menu.activeItem.subMenu = null;
  }
  removeClassName(menu.activeItem, "menuItemHighlight");
  menu.activeItem = null;
}

function menuInit(menu)
{
  var itemList, spanList
  var textEl, arrowEl;
  var itemWidth;
  var w, dw;
  var i, j;

  if (browser.isIE)
  {
    menu.style.lineHeight = "2.5ex";
    spanList = menu.getElementsByTagName("SPAN");
    for (i = 0; i < spanList.length; i++)
      if (hasClassName(spanList[i], "menuItemArrow"))
	  {
        spanList[i].style.fontFamily = "Webdings";
        spanList[i].firstChild.nodeValue = "4";
      }
  }

  itemList = menu.getElementsByTagName("A");
  if (itemList.length > 0) itemWidth = itemList[0].offsetWidth;
  else return;

  for (i = 0; i < itemList.length; i++)
  {
    spanList = itemList[i].getElementsByTagName("SPAN")
    textEl  = null
    arrowEl = null;
    for (j = 0; j < spanList.length; j++)
	{
      if (hasClassName(spanList[j], "menuItemText"))
        textEl = spanList[j];
      if (hasClassName(spanList[j], "menuItemArrow"))
        arrowEl = spanList[j];
    }

    if (textEl != null && arrowEl != null) textEl.style.paddingRight = (itemWidth - (textEl.offsetWidth + arrowEl.offsetWidth)) + "px";
  }

  if (browser.isIE)
  {
    w = itemList[0].offsetWidth;
    itemList[0].style.width = w + "px";
    dw = itemList[0].offsetWidth - w;
    w -= dw;
    itemList[0].style.width = w + "px";
  }
}

function getContainerWith(node, tagName, className)
{
  while (node != null)
  {
    if (node.tagName != null && node.tagName == tagName && hasClassName(node, className)) return node;
    node = node.parentNode;
  }

  return node;
}

function hasClassName(el, name)
{
  var i, list;
  list = el.className.split(" ");
  for (i = 0; i < list.length; i++)
    if (list[i] == name) return true;

  return false;
}

function removeClassName(el, name)
{
  var i, curList, newList;
  if (el.className == null) return;
  newList = new Array();
  curList = el.className.split(" ");
  for (i = 0; i < curList.length; i++)
    if (curList[i] != name) newList.push(curList[i]);
  el.className = newList.join(" ");
}

function getPageOffsetLeft(el)
{
  var x;
  x = el.offsetLeft;
  if (el.offsetParent != null) x += getPageOffsetLeft(el.offsetParent);

  return x;
}

function getPageOffsetTop(el)
{
  var y;
  y = el.offsetTop;
  if (el.offsetParent != null) y += getPageOffsetTop(el.offsetParent);

  return y;
}