function ShowImagePanel()
{
    var image_panel = document.getElementById('image_panel');
    
    w = 722;
    h = 2900;

    xc = Math.round((document.body.clientWidth/2)-(w/2))
    yc = Math.round((document.body.clientHeight/2)-(h/2))
    
    image_panel.style.left = xc + "px";
    image_panel.style.top  = yc + "px";
    image_panel.style.display = 'block';
}