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It's a better practice to put any credits in to the HTML (or CSS, or Javascript) mark-up in a commented out section, usually at the top of the document or before/ after the accredited section.
However, if you're insistent on using a hidden system, then you will be best using Javascript. jQuery is a "lite", simple but extensive, Javascript framework and their website contains ample documentation and examples. The action would be applied to the button to change the attribute of the elements you wish to show or hide.
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