It'd be easier as:

Code:
<?php 

$body1 = $LeadFirstName;
$body2 = $LeadLastName;

echo ("$body1 $body2 ");

echo 'Thank you for registering.  Your free ebook will be emailed to you within 48 hours.';

?>
Or even:
Code:
<?php 

$names = "$LeadFirstName $LeadLastName";

echo ("$names ");

echo 'Thank you for registering.  Your free ebook will be emailed to you within 48 hours.';

?>
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