var xmlHttp;

function checkCaptcha()
{
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
	  alert ("Your browser does not support AJAX!");
	  return;
	} 
	var url="validate.php";
	var ch=window.frames["captchaWidget"].document.getElementsByName('recaptcha_challenge_field')[0].value;
	var re=window.frames["captchaWidget"].document.getElementsByName('recaptcha_response_field')[0].value;
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("POST",url,true);
	xmlHttp.setRequestHeader("content-type", "application/x-www-form-urlencoded");
	xmlHttp.send('recaptcha_challenge_field='+ch+'&recaptcha_response_field='+re);
} 

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		if(xmlHttp.responseText=='Successful')
		{
			document.getElementById('validator').innerHTML=xmlHttp.responseText;
			document.forms["ajaxform"].submit();
		}
		else
		{
			document.getElementById('validator').innerHTML=xmlHttp.responseText;
			var f = document.getElementById('captchaWidget');
			f.src = f.src;
		}
	} 
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
	// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}