client_params
Client_params is designed as a drop-in replacement for action_params. It is "inline-safe" in that it does not get emptied when inside the scope of an inline.
Returns the value of a client GET/POST parameter.
Usage:
client_param('my')
client_param('my', 2)
client_param('my', 'get')
client_param('my', 2, 'post')
client_param('my', -count)
client_param('my', 'get', -count)