var curImage;
var transitionSpeed = 1500;
var transitionDeley = 3000;

$(function() {
    $("#main-photos img").css({display:"block", opacity:0});
    curImage = $("#main-photos img:first");
    curImage.css({opacity:1});
    finishAnimating();
    
})
function finishAnimating() {
    setTimeout(function() {
        curImage.animate({opacity: 0}, transitionSpeed);
        curImage = curImage.next();
        if(!curImage.length) {
            curImage = $("#main-photos img:first");
        }
        curImage.animate({opacity: 1}, transitionSpeed,finishAnimating);
    },transitionDeley);
}