function init() {
	hide_lvl(0);
    if (screen.width <= 800) {
        off = 7
    }
    else {
        off = (screen.width - 800) / 2;
    }
    menu1.style.left = off - 3;
    menu2.style.left = off + 194;
    menu3.style.left = off + 393;
    menu4.style.left = off + 593;
    menu1_1.style.left = off + 198;
    menu1_2.style.left = off + 198;
    menu3_1.style.left = off + 558;
}

function show(obj)
{
    eval(obj).style.visibility = "";
    if (obj == "menu1") { tab1.style.color="#FF7B00"; }
    if (obj == "menu2") { tab2.style.color="#FF7B00"; }
    if (obj == "menu3") { tab3.style.color="#FF7B00"; }
    if (obj == "menu4") { tab4.style.color="#FF7B00"; }
}
function hide(obj)
{
    eval(obj).style.visibility = "hidden";
    if (obj == "menu1") { tab1.style.color="#aaaaaa"; }
    if (obj == "menu2") { tab2.style.color="#aaaaaa"; }
    if (obj == "menu3") { tab3.style.color="#aaaaaa"; }
    if (obj == "menu4") { tab4.style.color="#aaaaaa"; }
}
function hide_tab(obj) { eval(obj).style.color="#aaaaaa" }
function hide_lvl(lvl)
{
    if (lvl == 0) {
        hide(menu1);
        hide(menu2);
        hide(menu3);
        hide(menu4);
        hide(menu1_1);
        hide(menu1_2);
        hide(menu3_1);
    }
    else if (lvl == 1) {
        hide(menu1_1);
        hide(menu1_2);
        hide(menu3_1);
    }
}