function naviPopup(elem,view)
{
    switch (elem) {
        case "subnavi_13":
            pos = '0px';
             /** 
              * Stop here, subnavi_13 should not open
              */
            return 0; 
        case "subnavi_8":
            pos = '175px';
            break;
        case "subnavi_9":
            pos = '350px';
            break;
        case "subnavi_10":
            pos = '525px';
            break;
    }
    document.getElementById(elem).style.left = pos;
    document.getElementById(elem).style.visibility = view;
}