kepnr = 1;
function kitesz(kepneve,keptxt) {
        temp = eval(document.getElementById("kep"+kepnr));
        temp.src = kepneve;
        opac("kep"+kepnr);

        temp = eval(document.getElementById("keptxt"+kepnr));
        temp.innerHTML = keptxt;

        kepnr = kepnr + 1;
        if (kepnr == 4) {kepnr = 1;}
}