function bodysize(size)
{
    if (size == 'sml') {
        window.parent.document.body.style.zoom = 1;
    } else if (size == 'mid') {
        window.parent.document.body.style.zoom = 1.1;
    } else if (size == 'big') {
        window.parent.document.body.style.zoom = 1.2;
    }
}