//change this echo '<a class="stunning-text-button" style="margin-top:' . $button_margin . 'px;" ...

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//change this
echo '<a class="stunning-text-button" style="margin-top:' . $button_margin . 'px;" href="' . find_xml_value($item_xml, 'button-link') . '" >';

//to this
echo '<a class="stunning-text-button" target="_blank" style="margin-top:' . $button_margin . 'px;" href="' . find_xml_value($item_xml, 'button-link') . '" >';