Pure PHP Templating Class/AJAX Problem

I use a pure templating class similar to something that I found here http://www.talkphp.com/advanced-php-programming/2568-pure-php-template-class .html. My question is how do you handle AJAX requests from XMLHttpRequest (); My class pumps out the entire page over again after the AJAX request is made. In other words the page is displaying twice. Thanks Tom Shaw php.coder@tx.rr.com "Common sense is the knack of seeing things as they are, and doing things as they ought to be done." Harriet <http://www.coolquotes.com/categories/harriet_elizabeth_beecher_stowe.html> Elizabeth Beecher Stowe