function createXMLHttpRequest() {
  try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {}
  try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
  try { return new XMLHttpRequest(); } catch(e) {}
  alert("XMLHttpRequest not supported");
  return null;
}
function ajax_encode(texto)
{
	texto = texto.toString();
	utftexto = ""
	for (var n = 0; n < texto.length; n++)
	{
		var c = texto.charCodeAt(n);
		if(c >= 128)
			utftexto += "&#"+c+";";
		else
			utftexto += String.fromCharCode(c);
	}
	utftexto = utftexto.replace(/\u2019/,"'");
	utftexto = utftexto.replace(/\u201C/,"\"");
	utftexto = utftexto.replace(/\u201D/,"\"");
	utftexto = encodeURIComponent(utftexto);
	return utftexto;
}