function changeCapture(){
		var serverPage="captcha/newcaptchacode.php";
		var xmlhttp = getXMLHttpObject();
		xmlhttp.open("GET", serverPage+'?c='+Math.random()); // random gegen IE6 cache problem
		xmlhttp.onreadystatechange = function() {
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {				
				 if(xmlhttp.responseText!=""){
					document.getElementById('captchaimage').src="captcha"+xmlhttp.responseText+".jpg";
					document.getElementById('capturecode').value=xmlhttp.responseText;				
				}				
			}
		}
		xmlhttp.send(null);
	}