/* POPUP MENU
Autor: Alfonso De Andrés
Fecha: 27 de Marzo del 2008
Version: 1.0
Requisitos especiales: 
	
	1) Necesario añadir los siguientes bloques de codigo en la página que queremos poner el popup.
	
	<!-- FONDO COMPLETO PARA OSCURECER -->
	<div id="fondo" style="display:none;"></div>

	<!-- MENU POPUP -->
	<div id="popup" class="box" style="left:50px;top:100px;display:none;width:500px;">	
		<!-- DIV DE BARRA DE TITULO DE POPUP -->
		<div class="bar" onmousedown="dragStart(event,'popup')">
			<div class="barTxt">
				&nbsp;PONER EL TITULO AQUÍ
			</div>
			<div style="vertical-align:middle;text-align:right">
				<a href="javascript:cerrarPopup('popup');" title=""><img class="barImg" src="/intranet/img/cancel_grey.gif"></a>
			</div>
		</div>
		
		<!-- DIV DE CONTENIDO -->
		<div class="content">
			<!-- PONER EL CONTENIDO AQUI -->
			Contenido...
		</div>
	</div>
	
	2) Se debe añadir a la pagina el CSS y el JS necesarios que son custonMenus.css y popup.js
	
	3) Como funciones JS estandar tenemos el abrirPopup(pid) y cerrarPopup(pid) donde pid es el id del popup correspondiente.
*/
var timer;
var opacity = 0;

function abrirPopup(pid) {
	var popUpElement = document.getElementById(pid);
	document.body.style.overflow = "hidden";
	oscureceFondo();
	popUpElement.style.display = "block";
}

function cerrarPopup(pid) {
	var popUpElement = document.getElementById(pid);
	aclaraFondo();
	document.body.style.overflow = "auto";
	popUpElement.style.display = "none";
}

function fadeIn(currentObjectId,maxOpacity) {
	var currentObject = document.getElementById(currentObjectId);
	currentObject.style.display = "block";
	if (opacity < maxOpacity){
		opacity += 20;	
	} else {
		clearInterval(timer);
	}
	currentObject.style.filter = "alpha(style=0,opacity=" + opacity + ")";
}

function fadeOut(currentObjectId,minOpacity) {
	var currentObject = document.getElementById(currentObjectId);
	if (opacity > 0){
		opacity -= 20;	
	} else {
		clearInterval(timer);
	}
	currentObject.style.filter = "alpha(style=0,opacity=" + opacity + ")";
	if (opacity == 0) currentObject.style.display = "none";
}

function oscureceFondo() {
	timer = setInterval("fadeIn('fondo',60)", 10);
}

function aclaraFondo() {
	timer = setInterval("fadeOut('fondo',0)", 5);
	
}

// Determine browser and version.
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();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

function dragStart(event, id) {

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Save starting positions of cursor and element.

  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;

  // Update element's z-index.

  //dragObj.elNode.style.zIndex = ++dragObj.zIndex;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
  }
}

function dragGo(event) {

  var x, y;

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    event.preventDefault();
}

function dragStop(event) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
}