function validateFormFields( fieldname ) {
	
	var field = document.getElementById('fieldname');
	
	var whiteSpace = /^[\s]+$/;
	
	if (field) {
		if ( field.value == '' || whiteSpace.test(field.value) ) {
	
			alert("Please fill required field: " + field.id);
			return false;
		}
		else
			return true;
	}
}