function showEsp() {
	document.getElementById('introtxt').style.display = 'block';
	document.getElementById('introtxten').style.display = 'none';
}

function showEng() {
	document.getElementById('introtxt').style.display = 'none';
	document.getElementById('introtxten').style.display = 'block';
}

function showCat() {
	document.getElementById('introtxt').style.display = 'none';
	document.getElementById('introtxten').style.display = 'block';
}

function fotoPop(url){ 
  var features="width="+0+",height="+0+",resizable=yes, scrollbars=yes";
  window.open(url,'popfoto',features);
  return false;
}