$(document).ready(function() {
	setInterval("rotate()",6000);
});

function rotate(){
         var img = rand();
	switch(img){
		case 0:
			//$('.main-box').animate({'background-image': 'url(../images/bg-main-box.jpg)'},{duration:3000});
			$('.main-box').css('background-image', 'url(../images/bg-main-boxb.jpg)').fadeIn(3000);
			break;//do nothing image is set via css
		case 1:
			$('.main-box').css('background-image', 'url(../images/bg-main-box-1.jpg)').fadeIn(3000);
			break;
		case 2:
			$('.main-box').css('background-image', 'url(../images/bg-main-box-2.jpg)').fadeIn(3000);
			break;	
	}
}

/* random number generator */
function rand() {
    return ( Math.floor ( Math.random ( ) * 3 ) );
}