function doVote(value,id_photo) {
    // Create new JsHttpRequest object.
    var req = new JsHttpRequest();
    // Code automatically called on load finishing.
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            // Write result to page element (_RESULT becomes responseJS).
            document.getElementById('result').innerHTML =req.responseJS.q;
            // Write debug information too (output becomes responseText).
            document.getElementById('debug').innerHTML = req.responseText;
        }
    }
    // Prepare request object (automatically choose GET or POST).
    req.open(null, 'http://poltava.info/include/photo_valid.php?id='+id_photo+'&code='+value, true);
    // Send data to backend.
    req.send( { q: value } );
}