…won’t let me paste the complete code into these comments. You’re looking for the script that starts at around line 77 which includes the code:
jQuery(function(){
jQuery('.spt').live('click',function(){
jQuery('.more_previews').css('position','absolute').fadeOut();
jQuery(jQuery(this).attr('href')).css('position','absolute').fadeIn().css('position','static');
return false;
});
});