I tried it:
$options = array('windowtarget' => '_blank');
but it doesnt work with me I frame :-\
<?php
include "./gallery/cpmfetch/cpmfetch.php";
$objCpm = new cpm("./gallery/cpmfetch/cpmfetch_config.php");
$options = array('windowtarget' => '_blank');
$objCpm->cpm_viewLastAddedMedia(1,2, $options);
$objCpm->cpm_close();
?>