function pic_show (id, pic, pic_x, pic_y)
{
    xx=eval (pic_x);
    yy=eval (pic_y);
    obj=document.getElementById (id);
    obj.innerHTML='<img src="' + pic + '" border="0" width="' + pic_x + '" height="' + pic_y + '" alt="">';
    obj.style.display="block";
}

function pic_hide ()
{
    obj.style.display="none";
}