// function for showing and hiding default texts in inputs
function inputDefaultShowHide(inputId, defaultText, isBlurAction) {
    var obj = document.getElementById(inputId);

    if (isBlurAction) {
        if (obj.value == "")
            obj.value = defaultText;
    }
    else {
        if (obj.value == defaultText)
            obj.value = "";
    }
}


function showImage(step) {
    if (imagesActual + step > imagesCount) {
        imagesActual = 1;
    } else if (imagesActual + step == 0) {
        imagesActual = imagesCount;
    } else {
        imagesActual += step;
    }
    imagesCounter.innerHTML = imagesActual + "/" + imagesCount;
}