change the to: field in agent ticket phone

[kenmurimi]

hi all?

i want to allow my agents to create phone tickets for our customers i.e from the phone ticket button, the issue i have is the to: field on the page shows the queues that the agent can view, i want the agents to first select the customer using the "customer" button then view the queues that this particular customer ha rw access and not the queues the agent has rw access to. this is because i have used customer group and that particular agent might not have access rights to the queue that the ticket is to be posted in.

any help greatly appreciated
thanks in advance