Simple ajax form using javascript no jQuery

Question

I\'m working with a form for which the mark-up I can\'t change & can\'t use jQuery. Currently the form post the results to a new window. Is it possible to change this to

Answer 1

function ajaxSubmit(form, callback) {
var xhr = new XMLHttpRequest();
var params = [].filter.call(form.elements, function (el) {return !(el.type in ['checkbox', 'radio']) || el.checked;})
.filter(function(el) { return !!el.name; }) //Nameless elements die.
.filter(function(el) { return !el.disabled; }) //Disabled elements die.
.map(function(el) {
    if (el.type=='checkbox') return encodeURIComponent(el.name) + '=' + encodeURIComponent(el.checked);
   else return encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value);
}).join('&'); //Then join all the strings by &
xhr.open("POST", form.action);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onload = callback.bind(xhr);
xhr.send(params);

};