var current_image = 1;
var next_image = 1;
var sum_images = 0;
function next()
{
    if (next_image != sum_images)
    {
        next_image++;
    }
    else
    {
        next_image = 1;
    }
    var obj = document.getElementById("galery"+next_image);
    obj.style.display = "block";
    var obj2 = document.getElementById("galery"+current_image);
    obj2.style.display = "none";
    document.getElementById("page").innerHTML = next_image+"/"+sum_images;
    
    current_image = next_image;
}
function previous()
{
    if (next_image != 1)
    {
        next_image--;
    }
    else
    {
        next_image = sum_images;
    }
    var obj = document.getElementById("galery"+next_image);
    obj.style.display = "block";
    var obj2 = document.getElementById("galery"+current_image);
    obj2.style.display = "none";
    document.getElementById("page").innerHTML = next_image+"/"+sum_images;
   
    current_image = next_image;
}
function init_galery(v)
{
    sum_images = v;
    next_image = 1;
    var obj = document.getElementById("galery"+next_image);
    obj.style.display = "block";
    document.getElementById("page").innerHTML = "1/"+sum_images;
   
    current_image = next_image;
}