var i = 0;

function zmen()
{
    var img;

    var moznosti = new Array(1,2,3,4,6,7,8);

    img = document.getElementById("meniciSe");

    i++;
    
    if(i == moznosti.length) i=0;

    img.setAttribute("src", "img/menici/"+moznosti[i]+".png");
}

setInterval(zmen, 10000);