With pure PHP.

Add this to the top of every page and give the page a .php extension:
<?php
if(parse_url($PHP_SELF, PHP_URL_HOST)=="domainnames101.110mb.com"){
$url = str_replace("domainnames101.110mb.com", "domainnames101.org", $PHP_SELF);
header( 'Location: http://domainnames101.org/' ) ;
}
?>
Just wrote that, might not work.
