Check fancybox, facebox, lightbox load or not

[eluser]kashyap8811[/eluser]
check fancybox, lightbox, facebox is loaded or not at server side

Code:

<?php

if('XMLHttpRequest' == @$_SERVER['HTTP_X_REQUESTED_WITH'])
{
echo "show in facebox ";
}

else
{
echo "show in full page ";
}
?>