function visimg( cate ) {
switch ( cate ) {
        case "news":
                document.getElementById("imgNew").firstChild.className = "selected";
                break;

        case "corporate":
                document.getElementById("imgCo").firstChild.className = "selected";
                break;

        case "products":
                document.getElementById("imgPro").firstChild.className = "selected";
                break;

        case "partners":
                document.getElementById("imgPar").firstChild.className = "selected";
                break;

        case "support":
                document.getElementById("imgSup").firstChild.className = "selected";
                break;

        case "investors":
                document.getElementById("imgIr").firstChild.className = "selected";
                break;

        default:
                break;
        }
}