Ajax request form

function submit_register(form)
{
    var strSubmit       = '';
    var formElem;
    for (i = 0; i < form.elements.length; i++) {
        formElem = form.elements[i];
        switch (formElem.type) {
                case 'text':
                case 'select-one':
                case 'hidden':
                case 'password':
                case 'textarea': strSubmit += formElem.name + '=' + escape(formElem.value) + '&'; break;
        }
    }
    
    ajaxReq.open('POST',  http+'/cart/register-data-page.php?req='+Math.random(), true);
    ajaxReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    ajaxReq.onreadystatechange = function() {
            if (ajaxReq.readyState == 4) {
                  alert(ajaxReq.responseText);
            }
    }
    ajaxReq.send(strSubmit);
    return false;}