var heroTimer = setInterval('rotateHero();', 4000);

function rotateHero(){
 if ( jQuery('#hero .left').children(':visible').is(':last-child') ){
 jQuery('#hero .left').children(':last-child').hide();
 jQuery('#hero .left').children(':first-child').fadeIn('fast');}
 else
 {jQuery('#hero .left').children(':visible').hide().next().fadeIn('fast');}
}