function change_state(e) {
if (e.className == "login") {
    e.className = "login_pressed";
    e.src = "../../../images/button/login_pressed.gif";
    return;
}
if(e.className == "login_pressed") {
    e.className = "login";
    e.src = "../../../images/button/login.gif";
    return;
}
if(e.className == "join_free") {
    e.className = "join_free_pressed";
    e.src = "../../../images/button/join_free_pressed.gif";
    return;
}
if(e.className == "join_free_pressed") {
    e.className = "join_free";
    e.src = "../../../images/button/join_free.gif";
    return;
}
if(e.className == "go") {
    e.className = "go_pressed";
    e.src = "../../../images/button/go_pressed.gif";
    return;
}
if(e.className == "go_pressed") {
    e.className = "go";
    e.src = "../../../images/button/go.gif";
}
}