var xmlHttp;

function GetXmlHttpObject() {
	try	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp = new XMLHttpRequest();
	}
	catch(e) {
		// Internet Explorer
		try	{
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try {
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
}

function validateCaptcha(chars) {
	GetXmlHttpObject();
	url = "capcthavalidationajax.php";
	url = url + "?doAction=Validate&txtCharacters=" + chars;

	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged() {
	if(xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {

		strResponseText = xmlHttp.responseText;
		if(strResponseText == "N") {
			document.getElementById('errMsg').style.display = '';
			reloadIframe();
		}
		else {
			document.getElementById('errMsg').style.display = 'none';
			document.formDownload.submit();
			closeAll();
		}
	}
}