function changeTile() {
    var color = document.orderForm.color.value.toLowerCase();
    document.tileImage.src = "../images/products/tile_" + color + ".gif";
}

// for sample packs only
function changeTile2() {
    var color = document.orderForm.color2.value.toLowerCase();
    document.tileImage2.src = "../images/products/tile_" + color + ".gif";
}