jQuery Grid Plugin - jqGrid

Hi, Ive looked through the documentation but Im struggling to find how to add additional data to the request.

I have a list of options in a dropdownlist, and depending on which option is selected, I need the grid to refresh. But I also need to pass the id from the dropdownlist to retrieve the right data.

I assume I just need to add a custom data object somewhere, any hints or suggestions please?

Edit:

I found it, the solution is to use postData with a format of:

postData: {name1: "value1"}

Regards

Luca