The small jQuery snippet below will make those plain old labels that follow checkboxes and radio buttons active. That is, they will activate/deactivate the checkboxes / radio buttons that they follow in the HTML.
As you can see, this will only affect labels that do not already have a for attribute.
$('form input:checkbox,form input:radio').each(function() {
if ($(this).next().is('label') && $(this).next().attr('for') == '') {
$(this).next().click(function(){
$(this).prev().click();
});
}
});