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var ahorro = true;


function addLoadEvent(func) { 
	var oldonload = window.onload; 
	if (typeof window.onload != 'function') { 
		window.onload = func; 
	} else { 
		window.onload = function() { 
			oldonload(); 
			func(); 
		} 
	} 
}

function insertAfter(newElement,targetElement) { 
	var parent = targetElement.parentNode; 
	if (parent.lastChild == targetElement) { 
		parent.appendChild(newElement); 
	} else { 
		parent.insertBefore(newElement,targetElement.nextSibling); 
	} 
}

// Muestra la foto pasada como parámetro. Lo que paso es un objeto link
function showPic(enlace) {
	if (!document.getElementById("foto")) return false;
	var numero = enlace.getAttribute("href").split("=")[1];
	var num = parseInt(numero);
	var ruta = enlace.getAttribute("href").split("=")[0];
	var foto = document.getElementById("foto");
	var foto_src = foto.getAttribute("src").split("/");
	foto_src[foto_src.length-1] = num+".jpg";
	if (ahorro)
		foto.setAttribute("src",urls[numero]);
	else
		foto.setAttribute("src",foto_src.join("/"));
	// Si estoy en una foto != 1 entonces tiene que existir la flecha de anterior
	if (num > 1) {
		// si no existe el enlace lo creamos
		if (!document.getElementById("foto-ant")) {
			var img_ant = document.createElement("img");
			if (ahorro)
				img_ant.setAttribute("src","fotos/thumbnails/"+(num-1)+".jpg");
			else {
				foto_src[foto_src.length-1] = "thumbnails/"+(num-1)+".jpg";
				img_ant.setAttribute("src",foto_src.join("/"));
			}
			img_ant.setAttribute("alt","");
			var foto_ant = document.createElement("a");
			foto_ant.setAttribute("id","foto-ant");
			foto_ant.setAttribute("href",ruta+(num-1));
			foto_ant.appendChild(img_ant);
			// quitamos el 'style' del enlace dcha
			document.getElementById("foto-sig").className = "";
			insertAfter(foto_ant,foto);
			// Al añadir el enlace despues de que se haya ejecutado prepareGallery, no funciona, asíque le añadimos el evento
			foto_ant.onclick = function() {
				showPic(this);
				return false;
			}
		}
	}
	// Si no estoy en la última foto entonces tiene que existir la flecha de siguiente
	if ((ruta.indexOf("slide") != -1 && num < 120) || (ruta.indexOf("parque-galeria") != -1 && num < 19)) {
		// si no existe el enlace lo creamos
		if (!document.getElementById("foto-sig")) {
			var img_sig = document.createElement("img");
			if (ahorro)
				img_sig.setAttribute("src","fotos/thumbnails/"+(num+1)+".jpg");
			else {
				foto_src[foto_src.length-1] = "thumbnails/"+(num+1)+".jpg";
				img_sig.setAttribute("src",foto_src.join("/"));
			}
			img_sig.setAttribute("alt","");
			var foto_sig = document.createElement("a");
			foto_sig.setAttribute("id","foto-sig");
			foto_sig.setAttribute("href",ruta+(num+1));
			foto_sig.appendChild(img_sig);
			insertAfter(foto_sig,document.getElementById("foto-ant"));
			// Al añadir el enlace despues de que se haya ejecutado prepareGallery, no funciona, asíque le añadimos el evento
			foto_sig.onclick = function() {
				showPic(this);
				return false;
			}
		}
	}
	// Ahora eliminamos la flecha anterior o siguiente, si hemos llegado a la primera o última foto
	if (num == 1) {
		if (document.getElementById("foto-ant")) {
			var foto_ant = document.getElementById("foto-ant");
			foto_ant.parentNode.removeChild(foto_ant);
			// le aplicamos el estilo a la flecha derecha para que quede bien colocada
			document.getElementById("foto-sig").className = "primera";
		}		
	}
	if ((ruta.indexOf("slide") != -1 && num == 120) || (ruta.indexOf("parque-galeria") != -1 && num == 19)) {
		if (document.getElementById("foto-sig")) {
			var foto_sig = document.getElementById("foto-sig");
			var parent = foto_sig.parentNode;
			parent.removeChild(foto_sig);
		}
	}
	
	if (document.getElementById("foto-ant")) {
		var foto_ant = document.getElementById("foto-ant");
		var img_ant = foto_ant.getElementsByTagName("img")[0];
		foto_ant.setAttribute("href",ruta+"="+(num-1));
		var thum_src = img_ant.getAttribute("src").split("/");
		thum_src[thum_src.length-1] = (num-1)+".jpg";
		img_ant.setAttribute("src",thum_src.join("/"));
		
	}
	if (document.getElementById("foto-sig")) {
		var foto_sig = document.getElementById("foto-sig");
		var img_sig = foto_sig.getElementsByTagName("img")[0];
		foto_sig.setAttribute("href",ruta+"="+(num+1));
		var thum_src = img_sig.getAttribute("src").split("/");
		thum_src[thum_src.length-1] = (num+1)+".jpg";
		img_sig.setAttribute("src",thum_src.join("/"));
	}
}


function prepareGallery() {
	if (!document.getElementById || !document.getElementsByTagName) return false;
	if (!document.getElementById("fotos")) return false;
	var cuerpo = document.getElementById("fotos");
	var links = cuerpo.getElementsByTagName("a");
	// asignamos a cada enlace la funcion de cambiar imágenes al hacer click
	for (var i=0; i<links.length; i++) {
		links[i].onclick = function() {
			showPic(this);
			return false;
		}		
	}	
}

addLoadEvent(prepareGallery);