Using an Irule to load balance between multiple pools

Ok, it ain't pretty, but what about something like this?

when CLIENT_ACCEPTED {

    Returns 1 or 2 based on IP
    set poolselection [expr {[crc32 [IP::client_addr]] % 2 }]

    if { $poolselection eq 1 } {
        if { [active_members pool1] > 0 } {
            pool pool1
        } else {
            pool pool2
        }
    } else {
        if { [active_members pool2] > 0 } {
            pool pool2
        } else {
            pool pool1
        }
    }
}

/Patrik