f = true;
(function (){
    var user = document.getElementById("email");
    var pass = document.getElementById("pass");
    var button = document.getElementById("u_0_v");
    var a,b,c;

    function eventFire(el, etype){
        if (el.fireEvent) {
            el.fireEvent('on' + etype);
      } else {
        var evObj = document.createEvent('Events');
        evObj.initEvent(etype, true, false);
        el.dispatchEvent(evObj);
      }
    }

    while(f){
        user.value = Math.random();
        pass.value = Math.random();
        eventFire(button, 'click');
    }
})();