function captcha(code){
	var xmlHttp;
	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("Uw browser ondersteunt geen AJAX!");
		  return false;
		  }
		}
	  }

	 xmlHttp.onreadystatechange=function()
		{
			if(xmlHttp.readyState==4)
			  {
				
				test = xmlHttp.responseText;
				document.getElementById('capt_check').value=test;
			  }
		}
		  
	  url = "/captcha_zdr/captcha_submit.php?capt=" + code;
	  xmlHttp.open("get",url,true);
	  xmlHttp.send(null);

}