Using ':' in ID atribute :     
I know it's a weird question bu If I had to use the **id= cu:w** , how could I select it with jquery?

    <script type="text/javaScript">
            $(function() {
                $('#cu:w').on('change', function() {
                    $(this).hide();
                });
            });
        </script>
        
        <fieldset>
            <legend>Check Here<input id='cu:w' type="checkbox"></legend>
            <span class="myClass">
                <p>This is the text.</p>
            </span>
        </fieldset>

Demo:
http://jsfiddle.net/cEAnM/227/
