page preview button link

wagn.slotReady(function(slot) {
var $sourcePreviewLink = slot.find('.source-preview-link').each(function(){
var url = $(this).attr('href');
if(url.indexOf("/source preview page") != 0)
  $(this).attr('href',"/source preview page?fromcerth=false&url="+encodeURIComponent(url));
});
});