<!-- 

        function checkRegCode(formulier)
{
	if(window.XMLHttpRequest)
	{
		try
		{
			req = new XMLHttpRequest();
		}
		catch (e)
		{
			req = false;
		}
		
	}
	else
	{	
		try {
        	req = new ActiveXObject("Msxml2.XMLHTTP");
      	} catch(e) {
        	try {
          		req = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch(e) {
          		req = false;
        	}
		}
	}

	if(req)
	{
		req.onreadystatechange = processRegCode;
		req.open("GET","checkCode.php?id="+formulier.code.value, false);
		req.send("");
		return req.responseText;
	}
}

function processRegCode()
{
	if(req.readyState == 4)
	{
		if(req.status == 200)
		{
			regCode = req.responseText;
		}
	}
}