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<?php
$input = preg_replace("/(www\.|http:\/\/)([^\s]+)/", '<a href="http://$1$2" target="_blank">$1$2</a>', $input);
?>

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function showEMail() {
   document.write('<a href="mailto:' + 'myemail' + '&#64;' + 'domain' + '.com' + '" >' + 'myemail' + '&#64;' + 'domain' + '.com' + '</a>');
}