function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

function updateURL() {
var theURL
theURL = 'http://www.metaweather.com/Syndicate/?format=' + getCheckedValue(document.forms['feedfinder'].elements['format']) + '&location=' + document.feedfinder.location.value
document.feedURL.theURL.value = theURL
}