iRule checking Pool is down

Great, many thanks. I did some modifications and now it works like it should. I really appreciate your help.

when HTTP_REQUEST {
    set up 0
    set down 0
    set disabled 0
    foreach member [members -list [LB::server pool]] {
        set status [LB::status pool [LB::server pool] member [lindex $member 0] [lindex $member 1]]
        switch $status {
            "up" {
                incr up 1
            }
            "down" {
                incr down 1
            }
            "session_disabled" {
                incr disabled 1
            }
        }
    }

    log local0. "Errorpage output: [LB::server pool] members (Active: $up) (Down: $down) (Disabled: $disabled)"



if {($up == 0) and ($disabled == 0)}    {
    HTTP::respond 200 content {




                                    ************************************************************************************************
                                    E-R-R-O-R: Sorry - no Node with status ACTIVE or DISABLED found!!! 
                                    "Errorpage output: [LB::server pool] members (Active: $up) (Down: $down) (Disabled: $disabled)"
                                    ************************************************************************************************


                                }


                                        } 

unset up down disabled
}