// This function loops through the array of values for the radio button and returns the selected value
// (or 'null' if none has been selected)
function getRadioValue(formObject) {
	var value=null;
	for (var i=0; i<formObject.length; i++) {
		if (formObject[i].checked) {
			value=formObject[i].value;
			break;
		}
	}
	return value;
}

function  checkFields() {

var radioValue = getRadioValue(document.competition.answer);
	
if (radioValue == null) {
	alert("Please chose an answer");
	return false
} 

if (document.competition.title.value==""){
	alert("Please your title");
	return false
}

if (document.competition.firstname.value==""){
	alert("Please your first name");
	return false
}

if (document.competition.surname.value==""){
	alert("Please your surname");
	return false
}

if (document.competition.email.value==""){
	alert("Please your email address");
	return false
}

}