var baseSubMenuClientID = 'sottomenu';
var baseImageMenuIconClientID = 'iconImage';
var openMenuIconUrl = '/images-webSitePark/leftMenuBox-Arrow.gif';
var closeMenuIconUrl = '/images-webSitePark/main-IcoArrow.gif';

function showHideMenu(i) {
    var subMenuElement = $get(baseSubMenuClientID + i);

    if (subMenuElement) {
        var isOpen = (subMenuElement.style.display == 'block') ? true : false;
        subMenuElement.style.display = isOpen ? 'none' : 'block';

        var imageMenuIconElement = $get(baseImageMenuIconClientID + i);

        if (imageMenuIconElement) {
            imageMenuIconElement.src = isOpen ? openMenuIconUrl : closeMenuIconUrl;
        }
    }
}