function getXmlHttp(){
    var xmlhttp;
    try {
	xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
	try {
	    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (E) {
	    xmlhttp = false;
	}
    }
    if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	xmlhttp = new XMLHttpRequest();
    }
    return xmlhttp;
}


function ajax_captcha_validator(theform, alertText) {
    var req = getXmlHttp();
    var url = "/securimage/securimage-alopecia-ajax.php";
    req.open('GET', url + "?code=" + theform.captcha_code.value , false);
    req.send(null);
    if(req.responseText == 'ok') {
      return true;
    }
    alert(""+ alertText);
    return false;
}