Te dejo mi metodo:
Código Javascript
:
Ver originalfunction ajax(){
try {
var req = new XMLHttpRequest();
}
catch(err1){
try {
var req = new ActiveXObject('Msxml2.XMLHTTP');
}
catch (err2) {
try {
var req = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (err3) {
var req = false;
}
}
}
return req;
}
Saludos