function sign(){
	var titulo = document.getElementById('gb1').value;
	var cuerpo = document.getElementById('gb2').value;
	var nombre = document. getElementById('gb3').value;
	var email = document.getElementById('gb4').value;
	ajax.open("GET","sign.php?title="+titulo+"&cont="+cuerpo+"&nombre="+nombre+"&email="+email);
	ajax.onreadystatechange=function(){
	if((ajax.readyState==1)||(ajax.readyState==2)||(ajax.readyState==3)){
		document.getElementById('firmas').innerHTML="Cargando";
	}
	if(ajax.readyState==4){
		document.getElementById('Bt_sign').disabled = true;
		document.getElementById('firmas').innerHTML=ajax.responseText;
		document.getElementById('gb1').value = " ";
		document.getElementById('gb2').value = " ";
		document. getElementById('gb3').value = " ";
		document.getElementById('gb4').value = " ";
	}
	document.getElementById('Bt_sign').disabled = false;
}
	ajax.send(null);
}
function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}

function objetus() {
         try {
                 objetus = new ActiveXObject("Msxml2.XMLHTTP");
        } catch ( e) {
                 try {
                         objetus= new ActiveXObject ("Microsoft.XMLHTTP");
                 } catch (E) {
                          objetus= false;
                }
        }
        if (! objetus && typeof XMLHttpRequest!= 'undefined') {
                 objetus = new XMLHttpRequest();
        }
        return objetus
}

var ajax = http = getHTTPObject(); // We create the HTTP Object