Usage

Add js and css files

<LINK rel="stylesheet" type="text/css" href="./radio-checkbox_files/style.css">
<SCRIPT src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></SCRIPT>

Add html

    <FORM action="#" method="get" accept-charset="utf-8">
        <FIELDSET class="checkboxes">
            <LABEL class="label_check" for="checkbox-01"><INPUT name="sample-checkbox-01" id="checkbox-01" value="1" type="checkbox" checked=""> I agree to the terms &amp; conditions.</LABEL>
            <LABEL class="label_check" for="checkbox-02"><INPUT name="sample-checkbox-02" id="checkbox-02" value="1" type="checkbox"> Please send me regular updates.</LABEL>
        </FIELDSET>
        <FIELDSET class="radios">
            <LABEL class="label_radio r_on" for="radio-01"><INPUT name="sample-radio" id="radio-01" value="1" type="radio" checked=""> This is option A...</LABEL>
            <LABEL class="label_radio" for="radio-02"><INPUT name="sample-radio" id="radio-02" value="2" type="radio"> and this is option B...</LABEL>
            <LABEL class="label_radio" for="radio-03"><INPUT name="sample-radio" id="radio-03" value="3" type="radio"> or simply choose option C</LABEL>
        </FIELDSET>
    </FORM>

Add javascript

<SCRIPT type="text/javascript">
    function setupLabel() {
        if ($('.label_check input').length) {
            $('.label_check').each(function(){ 
                $(this).removeClass('c_on');
            });
            $('.label_check input:checked').each(function(){ 
                $(this).parent('label').addClass('c_on');
            });                
        };
        if ($('.label_radio input').length) {
            $('.label_radio').each(function(){ 
                $(this).removeClass('r_on');
            });
            $('.label_radio input:checked').each(function(){ 
                $(this).parent('label').addClass('r_on');
            });
        };
    };
    $(document).ready(function(){
        $('.label_check, .label_radio').click(function(){
            setupLabel();
        });
        setupLabel(); 
    });
</SCRIPT>