var xmlhttp
var url = "registration.php?refcaptcha=1";
function refCaptcha(siteurl)
{
var url=siteurl+"index.php?option=com_blog&refcaptcha=1"; 
//alert(url);
	xmlhttp=null
	// code for Mozilla, etc.
	if (window.XMLHttpRequest)
	{
		xmlhttp=new XMLHttpRequest()
	}
	
	// code for IE
	else if (window.ActiveXObject)
	{
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	if (xmlhttp!=null)
	{
		xmlhttp.onreadystatechange=state_Change
		xmlhttp.open("GET",url,true)
		xmlhttp.send(null)
	}
	else
	{
		alert("Your browser does not support XMLHTTP.")
	}
}

function state_Change()
{
	// if xmlhttp shows "loaded"
	if (xmlhttp.readyState==4)
	{
		// if "OK"
		if (xmlhttp.status==200)
		{
			
			var captchaStr = (xmlhttp.responseText).split(',');
			document.getElementById('captchaImg').src=captchaStr[1];
			document.getElementById('hdCaptcha').value=captchaStr[0];
			//alert(captchaStr[1]);
		}
		else
		{
			//alert("Problem retrieving XML data")
		}
	}
}