var currentFoto="";
function swapPicture(ano, obra, titulo, tecnica, alto, ancho) {
	image = document.getElementById("foto");
	if (currentFoto==""){
		image.src = "gallery/" + ano + "/" + obra;
		currentFoto = 1;
	} else {
		//fadeOut("foto", 100);
		//setOpacity(foto, 0);
		image.src = "gallery/" + ano + "/" + obra;
		fadeIn("foto",0);
	}
	document.getElementById("titulo").innerHTML = titulo;
	var miString = ""; 
	if ((tecnica != "") && (tecnica != "0")) {
		miString += tecnica;
	}
	if ((alto != "") && (alto != "0")) {
		miString += ", " + alto + "cm";
	}
	if ((ancho != "") && (ancho != "0")) {
		miString += ", " + ancho + "cm";
	}
	miString += ", " + ano;
	document.getElementById("descripcion").innerHTML = miString;
}

function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 10;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
    }
  }
}
function fadeOut(objId,opacity) {
  if (document.getElementById) {
    if (opacity >= 0) {
       setOpacity(obj, opacity);
       opacity -= 10;
       window.setTimeout("fadeOut('"+objId+"',"+opacity+")", 100);
    }
  }
}