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Using Jamroom
Ceri - There's no need to wrap the jrCore_image code and link in an {if} statement as there is no variable for it (as you deduced). It will be there all the time.
Michael - I just Googled 'youtube icon' and selected 'images' there were plenty to choose from and download. Just look for a 'square' one and don't worry too much about its size (as long as its less than a few hundred pixels square) as the width and height parameters in the jrCore_image call will scale it.