Adding a div to selected radio button / checkbox text

Adding a div to selected radio button / checkbox text

I have one more question, I hope it's okay to post. I'm using this plugin:  http://www.jqueryscript.net/form/Easy-Custom-Checkbox-And-Radio-Input-Plugin-With-jQuery-ezMark.html which adds a div around radio buttons and checkboxes so you can replace them with images. I would like to be able to add a div around the <span> that contains the text for each radio button / checkbox, so that I can make the font bold when the radio button or checkbox is selected. 

What would be the easiest way to do this? I think I could reuse the js code from the plugin above, since it basically does what I want which is add a div and changes the classes of the div depending on whether a button or checkbox is selected.

Thanks!