var div = document.createElement('DIV');
div.style.position = 'absolute';
div.style.visibility = 'hidden';
div.innerHTML =
'<form enctype="multipart/form-data"></form>' +
'<iframe src="javascript:\'\'" style="width:0px; height:0px; overflow:hidden; border:none"></iframe>';
var form = div.getElementsByTagName('FORM')[ 0 ];
var iframe = div.getElementsByTagName('IFRAME')[ 0 ];

var elements = document.form;
var url = 'index.php';
var method = 'POST';

for (var i= 0 ; i<elements.length; i++) {
        var e = v.elements[i];
        if (e.name) {
                var e2 = document.createElement('INPUT');
                e2.type = 'hidden';
                e2.name = e.name;
                e2.value = e;
                form.appendChild(e2);
        }
}
form.enctype = "multipart/form-data";
form.action = url;
form.method = method;
form.target = iframe.name;
form.onsubmit = null;
form.submit();