function menuover(n)
{
    // variable definitions
    var bfly_1 = document.getElementById('bfly_1'); 
    var bfly_2 = document.getElementById('bfly_2'); 
    var bfly_3 = document.getElementById('bfly_3'); 
    var bfly_4 = document.getElementById('bfly_4'); 
    var bfly_5 = document.getElementById('bfly_5'); 
    var bfly_6 = document.getElementById('bfly_6'); 

    if (n < 1) {
        bfly_1.src='/graphics/bfly-b.png';
        bfly_2.src='/graphics/bfly-b.png';
        bfly_3.src='/graphics/bfly-b.png';
        bfly_4.src='/graphics/bfly-b.png';
        bfly_5.src='/graphics/bfly-b.png';
        bfly_6.src='/graphics/bfly-b.png';
    }
    else if (n == 1) {
        bfly_1.src='/graphics/bfly-l.png';
    }
    else if (n == 2) {
        bfly_2.src='/graphics/bfly-r.png';
    }
    else if (n == 3) {
        bfly_3.src='/graphics/bfly-l.png';
    }
    else if (n == 4) {
        bfly_4.src='/graphics/bfly-r.png';
    }
    else if (n == 5) {
        bfly_5.src='/graphics/bfly-l.png';
    }
    else if (n == 6) {
        bfly_6.src='/graphics/bfly-r.png';
    }
}

function swapfilm(n)
{
    var top_strip = document.getElementById('top_strip');
    var bottom_strip = document.getElementById('bottom_strip');

    if (n < 1) {
        top_strip.style.backgroundImage="url('/graphics/strip_blocks.png')";
        bottom_strip.style.backgroundImage="url('/graphics/strip_blocks.png')";
    }
    else if (n == 1) {
        top_strip.style.backgroundImage="url('/graphics/strip_radman.png')";
        bottom_strip.style.backgroundImage="url('/graphics/strip_radman.png')";
    }
    else if (n == 2) {
        top_strip.style.backgroundImage="url('/graphics/strip_bones.png')";
        bottom_strip.style.backgroundImage="url('/graphics/strip_bones.png')";
    }
    else if (n == 3) {
        top_strip.style.backgroundImage="url('/graphics/strip_carrots.png')";
        bottom_strip.style.backgroundImage="url('/graphics/strip_carrots.png')";
    }
    else if (n == 4) {
        top_strip.style.backgroundImage="url('/graphics/strip_mice.png')";
        bottom_strip.style.backgroundImage="url('/graphics/strip_mice.png')";
    }
}

function showsubmenu(n)
{
    // variable definitions
    var submenu_1 = document.getElementById('submenu_1');
    var submenu_2 = document.getElementById('submenu_2');
    var submenu_3 = document.getElementById('submenu_3');
    var submenu_4 = document.getElementById('submenu_4');
    var submenu_5 = document.getElementById('submenu_5');
    var submenu_6 = document.getElementById('submenu_6');

    submenu_1.style.display="none";
    submenu_2.style.display="none";
    submenu_3.style.display="none";
    submenu_4.style.display="none";
    submenu_5.style.display="none";
    submenu_6.style.display="none";

    if (n == 1) {
        submenu_1.style.display="inline";
    }
    else if (n == 2) {
        submenu_2.style.display="inline";
    }
    else if (n == 3) {
        submenu_3.style.display="inline";
    }
    else if (n == 4) {
        submenu_4.style.display="inline";
    }
    else if (n == 5) {
        submenu_5.style.display="inline";
    }
    else if (n == 6) {
        submenu_6.style.display="inline";
    }
}