function preloadimages() {
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}



var nscp = (navigator.appName == "Netscape")
var ismc = (navigator.appVersion.indexOf("Mac") != -1)
var vers = parseFloat(navigator.appVersion.substring(22,25))
function getObj(obj){
	if (nscp){
		compLayr = document.layers[obj]
	}else{
		compLayr = eval("document.all." + obj + ".style")
	}
	return compLayr
}


function llamarasincrono(url, id_contenedor){
	var pagina_requerida = false
	if (window.XMLHttpRequest) {
		pagina_requerida = new XMLHttpRequest()
	} else if (window.ActiveXObject){
		try {
			pagina_requerida = new ActiveXObject("Msxml2.XMLHTTP")
		} 
		catch (e){
			try{
				pagina_requerida = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e){}
		}
	}
	else
		return false
		pagina_requerida.onreadystatechange=function(){
		cargarpagina(pagina_requerida, id_contenedor)
	}
	pagina_requerida.open('GET', url, true) 
	pagina_requerida.send(null)
}

function cargarpagina(pagina_requerida, id_contenedor){
	if (pagina_requerida.readyState == 4 && (pagina_requerida.status==200 || window.location.href.indexOf("http")==-1))
	document.getElementById(id_contenedor).innerHTML=pagina_requerida.responseText
}



function pone_marca(x) {
	obj = document.getElementById(x);
	if (obj.value=="") {
		obj.value = obj.id;
		obj.style.color = "#dddddd";
		obj.focus();
	}
}
function saca_marca(x) {
	obj = document.getElementById(x);
	if (obj.value==obj.id) {
		obj.value = "";
		obj.style.color = "#000000";
	}
}



function cambia_almanaque(mes,ano){
	llamarasincrono("externos/almanaque_home.asp?mes="+mes+"&ano="+ano, "almanaque_home");
}
function muestra_recomendar(){
	if (document.getElementById("form_recomendar").style.display=="none"){
		document.getElementById("form_recomendar").style.display="block";
	}else{
		document.getElementById("form_recomendar").style.display="none";
	}
}
function recomendar_libro(){
	n = document.getElementById("recomendar_nombre").value;
	e = document.getElementById("recomendar_email").value;
	o = document.getElementById("recomendar_ocupacion").value;
	t = document.getElementById("recomendar_texto").value;

	llamarasincrono('externos/wait.htm', 'form_recomendar');
	llamarasincrono("externos/recomendar_libro.asp?n="+n+"&e="+e+"&o="+o+"&t="+t,"form_recomendar");
}
function muestra_newsletter(){
	if (document.getElementById("form_newsletter").style.display=="none"){
		document.getElementById("form_newsletter").style.display="block";
	}else{
		document.getElementById("form_newsletter").style.display="none";
	}
}
function envia_newsletter(){
	n = document.getElementById("newsletter_nombre").value;
	e = document.getElementById("newsletter_email").value;

	llamarasincrono('externos/wait.htm', 'form_newsletter');
	llamarasincrono("externos/envia_newsletter.asp?n="+n+"&e="+e,"form_newsletter");
}