var slideIndex=1;
showSlides(slideIndex);

function plusSlides(n){
    showSlides(slideIndex += n);
}

function currentSlide(n){
    showSlides(slideIndex = n);
}

function showSlides(n){
    var i;
    var slides = document.getElementsByClassName("img_slide");

    if (n > slides.length){
        slideIndex = 1;
    }
    if(n < 1){
        slideIndex = slides.length;
    }
    for (i = 0; i < slides.length;i++){
        slides[i].style.display = "none";
    }
    slides[slideIndex-1].style.display="block";

}

function clicker(){
    document.getElementsByClassName("next").onclick = plusSlides(1);
}

$('.slide').mouseenter(function(){
    clearInterval(timer);
});

var timer = setInterval(clicker,3000);

$('.slide').mouseleave(function(){
    timer = setInterval(clicker,3000);
});

$('#inter,#registration').click(function(){
    clearInterval(timer);
});

$(".lightbox_close").click(function(){
    timer = setInterval(clicker,3000);
});