$(document).ready(function(){
    var bgImages = [ 'photo07.jpg', 'photo02.jpg', 'photo03.jpg', 'photo04.jpg' ];
    var currImage = 'photo07.jpg';
    setInterval( function(){
        do{
            var randImage = bgImages[Math.ceil(Math.random()*(bgImages.length-1))];
        }while( randImage == currImage )
        currImage = randImage;
        $('#slideshow').BgImageTransition( 'img/photo/'+currImage );
    }, 10000)
})