Edit file (in your Site folder) fancyboxwithmultiimagesupport.js and look for the line (it's near the top):
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var imgid = 'im-' + anc;
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$( "img.lbicon[data-lbpimgid='" + imgid + "']" ).removeClass('lbiconselected');
$( icon ).addClass('lbiconselected');
Add the bottom add a line:
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.lbiconselected {border:1px solid blue !important;}