#middle 
{
    width: 100%;
}

#gamewindow
{
    width: 448px;
    height: 576px;
    left: 50%;
    margin-left: -224px;
}

#leftborder
{
    background-color: Yellow;
    float: left;
}

#rightborder
{
    float: left;
}

#footer
{
    width: 100%;
}