function CheckFields(sFormName) {
	if(document.forms[sFormName]) {
		sValue = document.forms[sFormName].plz.value;
		if(sValue.length == 5) {
			document.forms[sFormName].radius.disabled = false;
			document.forms[sFormName].remember.disabled = false;
		}
		else {
		 	document.forms[sFormName].radius.disabled = true;
			document.forms[sFormName].remember.disabled = true;
		}
	}
}