jQuery Grid Plugin - jqGrid

Hi All.

I would like to pass through values to a subgrid, but don't know how

In my case one of my columns is a calendar period in the format of "Month Year", so each row is a given month of a year. My aim to to pass through this period for the selected row of when requesting the subgrid. By default a simple row id is sent through to the server.

In my server side script i'm restricting a SQL query to pull out data base on a given calendar period.

My code would look something like:

subGrid: true,
    subGridUrl : "subgrid.php?period="+period,
    subGridModel: [ {
      name:  ['Type', 'Absolute', 'Relative'],
      width : [200, 200, 200, 200]
      }
    ],

How would i set period to the value of a specific cell?