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 esNull( variable){
  //Defensive programming at work! :(
  try {
    if ( variable==null)
    	return true;
  
  } catch(e){
    return true;  
  }
  return false;
}


function pageMousedown(event) {
  var el;
  if (esNull(activeButton))
    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,menuId);
    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);
}


var abierto = false;
var olditem = false;
var contadorCerrar = 0;

function AutoCerrar(){
  //window.status = "Cnt: "+contadorCerrar;

  //if (!abierto) return;
  if(!contadorCerrar || !olditem) return; 
  
  contadorCerrar--;
  
  if (contadorCerrar<2){
    	    
     
  	//if (olditem.subMenu != null) {
    closeSubMenu(abierto);
    olditem.style.visibility = "hidden";
   // 	olditem.subMenu = null;
  	//}
  	removeClassName(olditem, "menuItemHighlight");  	
	
  
    contadorCerrar=0;
    olditem=0;
    //alert("info:" + olditem);
     
    return;
  }
  
 //alert("Cnt:"+contadorCerrar);

  
  setTimeout("AutoCerrar()",100);
}



function depressButton(button,menuId) {
  var x, y;
  var isie = "esIE";
  var pad = 0;

  button.className += " menuButtonActive";

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

  if (browser.isIE) {
    x += button.offsetParent.clientLeft;
    y += button.offsetParent.clientTop;    
    
    //y = getPageOffsetTop(button) -( document.body.offsetHeight );
    //document.body.scrollTop
    //alert("bof:"+ button.offsetHeight+",otop:"+getPageOffsetTop(button));
    
    //INFO: hubo que encontrar este valor por pruebas, por tanto este codigo
    // podria tener inconsistencias.
    
    /*if (Browser.version < 6){
    	pad = 144;    
    }*/
    pad = -6;//baja el menu 
    
    y = y  -   button.offsetTop - pad;    	    
  }


  if (menuId == "Enlaces"){
    x = x - 89;  
  }
  

  //alert("X:"+x+",Y:"+y+",is:"+isie);
	//alert("docoh:"+document.body.offsetHeight);//siempre 600
	//alert("dbstop:" + document.body.scrollTop);//siempre 0
	//alert("ofctop:" + button.offsetParent.clientTop);//siempre cero
	//alert("ctop:" + button.offsetTop);	

  button.menu.style.left = x + "px";
  button.menu.style.top  = y + "px";
  button.menu.style.visibility = "visible";
  
  //abierto = button.menu;
  olditem = button.menu;
   
  contadorCerrar = 120;
  
  setTimeout('AutoCerrar()',1000);
  //return false;
  
}

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;
    
   abierto = menu;

  //Retrasa el cerrar si se pone el raton sobre una opcion
  contadorCerrar = 100;
  
  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);
  }

//  olditem = item;
  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 fast_getPageOffsetTop(el) {
  var y;
  y = el.offsetTop;
  
  //y = (el.offsetHeight - el.clientHeight) / 2;
   
  if (el.offsetParent != null)
    y += getPageOffsetTop(el.offsetParent);

  return y;
}

function getPageOffsetTop(el)
{
    y = el.offsetTop
   
    //y = document.body.scrollTop-getPageOffsetTop(el)+document.body.offsetHeight;
    
    for (e = el.offsetParent; e; e = e.offsetParent)      
      y += e.offsetTop;
      
    
    return y
}