function check_search_form(lang) {
    if (document.forms['search_form']) {
        if (document.forms['search_form'].elements['keywords'].value == '') {
            if (lang == 'bg') {
                alert('Моля въведете поне една дума или ключова фраза в полето за търсене.');
            } else if (lang == 'en') {
                alert('Please enter keyword for your search.');
            }
        } else {
            document.forms['search_form'].submit();
        }
    }
}

function swap_top_nav(this_image, top_nav_id, top_nav_state) {
    if ((this_image) && (top_nav_selected != top_nav_id)) {
        this_image.src = top_buttons[top_nav_id][top_nav_state].src;
    }
}

function swap_top_nav_lang(this_image, lang_id, lang_state) {
    if ((this_image) && (lang_nav_selected != lang_id)) {
        this_image.src = lang_buttons[lang_id][lang_state].src;
    }
}

function clear_support_form() {
    if (document.forms['support_form']) {
        if (document.forms['support_form'].elements['scid']) {
            document.forms['support_form'].elements['scid'].value = '';
        }
        if (document.forms['support_form'].elements['product_id']) {
            document.forms['support_form'].elements['product_id'].value = '';
        }
    }
}

function clear_support_form_product() {
    if (document.forms['support_form']) {
        if (document.forms['support_form'].elements['product_id']) {
            document.forms['support_form'].elements['product_id'].value = '';
        }
    }
}

function blinker() {
    if ((document.getElementById("blink").style.color == "#575757")
            || (document.getElementById("blink").style.color == "")
            || (document.getElementById("blink").style.color == "rgb(87, 87, 87)")) {
        document.getElementById("blink").style.color = "#CCC";
    } else {
        document.getElementById("blink").style.color = "#575757";
    }
    setTimeout("blinker()", 1000);
}
setTimeout("blinker()", 2000);