function isEmpty( field, name ) {
	if( field.value.length == 0 ) {
		alert( "\"" + name + "\" is required." );
		return true;
	}
	return false;
}

function checkForm() {
	var form = document.registration;

	if( isEmpty( form.fname, "First Name" ) ||
		isEmpty( form.lname, "Last Name" ) ||
		isEmpty( form.affil, "Affiliation" ) ||
		isEmpty( form.address, "Address" ) ||
		isEmpty( form.city, "City" ) ||
		isEmpty( form.state, "State" ) ||
		isEmpty( form.zip, "Zip" ) ||
		isEmpty( form.email, "Email" ) ) return false;

	return true;
}