function _popup(win_name, url, w, h)
{
	if (url && w && h)
	{
		win_popup = window.open(url, win_name, "width=" + w + ",height=" + h + ",scrollbars=yes,resizable=yes");
		win_popup.focus();
	}
}

function popup(url)
{
	_popup("foto", url, 700, 700);
}

function popup_init()
{
    if (!document.images || !document.images[0])
    {
        return;
    }
    
    w = document.images[0].width;
    h = document.images[0].height;
    window.moveTo((screen.availWidth - w) / 2, (screen.availHeight - w) / 2);
    window.resizeTo(w, h);
    
    self.focus();
}