function getXmlHttpRequestObject() 
{
	if (window.XMLHttpRequest) 
	{
		return new XMLHttpRequest(); 
	}
	else if (window.ActiveXObject)
	{
		return new ActiveXObject("Microsoft.XMLHTTP"); 
	}
	else 
	{
		alert("Your browser doesn't support the XmlHttpRequest object.");
	}
}

var receiveReq = getXmlHttpRequestObject();

function makeRequest(url, param) 
{
	if (receiveReq.readyState == 4 || receiveReq.readyState == 0) 
	{
		receiveReq.open("POST", url, true);
		receiveReq.onreadystatechange = updatePage; 
		receiveReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		receiveReq.setRequestHeader("Content-length", param.length);
		receiveReq.setRequestHeader("Connection", "close");
		receiveReq.send(param);
	}   
}

function updatePage() 
{
	if (receiveReq.readyState == 4) 
	{
		if (receiveReq.responseText == "T1")
		{
			$('result').addClassName('success');
			$('result').innerHTML = "Verification Successful"
			$('regis').disabled = false;
		}
		else
		{
			$('result').addClassName('error');
			$('result').innerHTML = "Verification Failed"
			$('regis').disabled = true;
			img = $('imgCaptcha'); 
			img.src = 'create_image.php?' + Math.random();
		}
	}
}

function getParam(theForm) 
{
	var url = 'captcha.php';
	var postStr = theForm.txtCaptcha.name + "=" + encodeURIComponent( theForm.txtCaptcha.value );
	makeRequest(url, postStr);
}