Rollbook1 = new Array()

Rollbook1[0] = new Image(221, 150)
Rollbook1[0].src = "graphics/book1.jpg"

Rollbook1[1] = new Image(221, 150)
Rollbook1[1].src = "graphics/book1_over.jpg"

Rollbook2 = new Array()

Rollbook2[0] = new Image(212, 150)
Rollbook2[0].src = "graphics/book2.jpg"

Rollbook2[1] = new Image(212, 150)
Rollbook2[1].src = "graphics/book2_over.jpg"

function SwapOut1() {
    document.book1.src = Rollbook1[1].src;
    return true;
}

function SwapBack1() {
    document.book1.src = Rollbook1[0].src;
    return true;
}

function SwapOut2() {
    document.book2.src = Rollbook2[1].src;
    return true;
}

function SwapBack2() {
    document.book2.src = Rollbook2[0].src;
    return true;
}