rrdping_graph ()
{
    last_x="$1"
    host="$2"
    if [ -f $rrd_dbpath/ping/ping-$host.rrd ]
    then
        /usr/bin/rrdtool graph /srv/www/img/ping-$host-$last_x.png --title "Ping $host - $last_x" \
            --imginfo '<IMG SRC="/img/%s" WIDTH="%lu" HEIGHT="%lu" ALT="Ping $host">' \
            $rrd_width $rrd_height $rrd_common_opts --watermark "$rrd_watermark" \
            --end now --start end-${last_x} \
            --vertical-label "Time" \
            --font "WATERMARK:8" \
            $rrd_grid_background \
            DEF:time=$rrd_dbpath/ping/ping-$host.rrd:ping:AVERAGE \
            LINE1:time$rrd_col_green:"Time \n" \
            COMMENT:"Letztes update\:\t$rrd_last_update"
    else
        show_error "$_MN_err" "no rrd-database for $host"
    fi
}