Vanilla 2

It's probably the YouTube link you've chosen. In the upper-right of corner of YouTube is a box with 2 sets of code. One is URL and the other is Embed. Use the code for "URL".

Here's a working example:

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function PrettyPhotoDelegate(where, title, comment) {

$.prettyPhoto.open(where, title, comment);

// $.prettyPhoto.changePage('next');
// $.prettyPhoto.changePage('previous');
// $.prettyPhoto.close();
}