Source port based load balancing using the persistence least connection

We have 1400 client with define source port from 8000 to 10000 and destination is 2 server for example (x.x.x.x and y.y.y.y)

We need irules for  8000 to 8500 source port load balance to x.x.x.x server if x.x.x.x fail send to y.y.y.y same thing goes all port.

Please help us to create the irules.

1)      Source port 8000 to 8500

2)      Source port 8501 to 9000

3)      Source port 9001 to 9500

4)      Source port 9501 to 10000

when CLIENT_ACCEPTED {

 if { [TCP::client_port] starts_with "8000" ends_with "8500" } {

   pool pool1

 } elseif { [TCP::client_port] starts_with "8501" ends_with "9000" } {

   pool pool1

 }

 elseif { [TCP::client_port] starts_with "9001" ends_with "9500" } {

   pool pool1

 }

 elseif { [TCP::client_port] starts_with "9501" ends_with "10000" } {

   pool pool1

 }

}