//Francis : Start the timer and set currentSlide
var timer = "";
timer = window.setInterval(nextSlide, 5000);
var currentSlide = 1;

function nextSlide() {
    if ($(".home_slide").is(":animated") == false) {
        $('#home_slide_'+currentSlide).animate({ opacity: 0 }, 600);
        $('#slider_nav li.selected_slider_nav').removeClass('selected_slider_nav');
        if (currentSlide == 4) {
            currentSlide = 1;
        } else {
            currentSlide ++;
        }
        $('#home_slide_'+currentSlide).animate({ opacity: 1 }, 600);
        $('#slider_nav li#slider_nav'+currentSlide).addClass('selected_slider_nav');
        resetTimer();
    }
}

function changeSlide(slideId) {
    if ($(".home_slide").is(":animated") == false && currentSlide != slideId) {
        $('#home_slide_'+currentSlide).animate({ opacity: 0 }, 600);
        $('#slider_nav li.selected_slider_nav').removeClass('selected_slider_nav');
        $('#home_slide_'+slideId).animate({ opacity: 1 }, 600);
        $('#slider_nav li#slider_nav'+slideId).addClass('selected_slider_nav');
        currentSlide = slideId;
        resetTimer();
    }
}

function resetTimer() {
    window.clearInterval(timer);
    timer = "";
    timer = window.setInterval(nextSlide, 5000);
}