function enableDisableZipcodeRadius(zipcode) {	
	if (zipcode.length == 5) {
		try {
			// try to convert to number in order make sure zipcode is a number!
			Number(zipcode);
			// if successfull converted enable zipcodeRadiusField...
			//document.getElementById("umkreis").disabled = false;
			document.getElementById("umkreiswahler").style.display = "block";
			document.getElementById("ort").style.display = "block";
			getContentViaAjax('plzzustadt','1',zipcode);
			if((document.forms['sanago_suche'].elements["umkreis"]) && (document.forms['sanago_suche'].elements["umkreis"].value == "")){
				document.forms['sanago_suche'].elements["umkreis"].value = "100";
			}
					
		} catch (e) {
			disableZipcodeRadius();
		}
	} else {
		disableZipcodeRadius();
	}
}

function disableZipcodeRadius() {
	var radiusOptions = document.getElementById("umkreis");
	for (var i = 0; i < radiusOptions.length; i++) {
		if(radiusOptions[i].value == "") {
			radiusOptions[i].selected = true;
			break;
		}
	}
	document.getElementById("ort").innerHTML = '';
	//document.getElementById("umkreiswahler").style.display = "none";
	//document.getElementById("umkreis").disabled = true;
}