var ajax;

        //Funcion que crea el Ajax
        function creaajax(){
            var objajax=false;
            if (window.ActiveXObject){
                objajax = new ActiveXObject("Microsoft.XMLHttp");
                }else if((window.XMLHtppRequest) || (typeof XMLHttpRequest)!=undefined){
                    objajax = new XMLHttpRequest;
                } else {
                    alert("No soporta Ajax");
                    return;
                }
                return objajax;
        }

        function enviaContadorPortal(portal) {
            ajax = creaajax();
            ajax.open("POST", "http://sol.mintra.gob.pe/empleoperu/Portal.do?method=visitaSave&PORT_CODPORTAL=" + portal, true);
            ajax.onreadystatechange =
                                function procesaenviaContadorPortal() {
                                    if (ajax.readyState == 4) {
                                        if (ajax.status == 200) {
                                            //ok
                                        } else {
                                            //form.UBI_CODDISTRITO.disabled = true;
                                        }
                                    } else if (ajax.readyState == 1) {
                                        //form.UBI_CODDISTRITO.disabled = true;
                                    }
                                };
            ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            ajax.send(null);
        }