Redirect during web site maintenance

Here is our irule. We have the same issue, we want certain users to be able to access the site to test while everone else is sent to maintenance page, this irule checks for certian ip addresses and sends them to the site, everyone else, gets send to the maintenancne page. Hope you can use it.

when HTTP_REQUEST {
  if { [IP::client_addr] starts_with "10." } {
    if { [HTTP::uri] eq "/" and [HTTP::host] eq "your.url.com" } {
      HTTP::redirect "http://your.url.com/wps/portal"
    } elseif { [HTTP::uri] eq "/" and [HTTP::host] eq "your.url.com" } {
      HTTP::redirect "https://your.url.com/wps/portal"
    } else {
      if { [IP::client_addr] eq "10.0.16.170" } {
        use pool NG-loadtest1-pool
      } elseif { [IP::client_addr] eq "10.0.16.175" } {
        use pool NG-loadtest2-pool
      } elseif { [IP::client_addr] eq "10.0.16.240" } {
        use pool NG-loadtest3-pool
      } else {
        persist source_addr 255.255.255.255 1800
        use pool new-fsc-pool
      }
    }
  } else {
    use pool nextgen-down
  }
}