#frame_header {
    background-color: #00F000;
    margin-left: 25%;
    width: auto;
    padding: 0;
}
#frame_menu {
    width: 25%;
    position: fixed;
    overflow: auto;
    float: left;
    top: 0;
    bottom: 0;
    background: aqua;
    color: olive;
}

#frame_main {
    margin-left: 25%;
    margin-top: 0;
    width: auto;
    position: relative;
    overflow: auto;
}