function showdiv(name)
{
    if (document.all){
        eval('document.all.sub_menu_news.style.visibility = "hidden" ');
        eval('document.all.sub_menu_about.style.visibility = "hidden" ');
        eval('document.all.sub_menu_product.style.visibility = "hidden" ');
        eval('document.all.sub_menu_cont.style.visibility = "hidden" ');
    } else if (document.layers) {
        eval('document.layers[sub_menu_news].style.visibility = "hidden" ');
        eval('document.layers[sub_menu_about].style.visibility = "hidden" ');
        eval('document.layers[sub_menu_product].style.visibility = "hidden" ');
        eval('document.layers[sub_menu_cont.style].visibility = "hidden" ');
    } else if (document.getElementById) {
        eval('document.getElementById("sub_menu_news").style.visibility = "hidden" ');
        eval('document.getElementById("sub_menu_about").style.visibility = "hidden" ');
        eval('document.getElementById("sub_menu_product").style.visibility = "hidden" ');
        eval('document.getElementById("sub_menu_cont").style.visibility = "hidden" ');
    }

    if (document.all){
        eval('document.all.' + name + '.style.visibility = "visible" ');
    } else if (document.layers) {
        eval('document.layers["' + name + '"].visibility = "visible" ');
    } else if (document.getElementById) {
        eval('document.getElementById("' + name + '").style.visibility = "visible" ');
    }
}

function hidediv(name)
{
    if (document.all){
        eval('document.all.' + name + '.style.display = "none" ');
    } else if (document.layers) {
        eval('document.layers["' + name + '"].display = "none" ');
    } else if (document.getElementById) {
        eval('document.getElementById("' + name + '").style.display = "none" ');
    }
}