jQuery Grid Plugin - jqGrid

Good day jqGridCoders,

    I'm just a newbie in this fantastic jquery framework, I know you can help me with my (I guess, its simple to you guys) problem with "oper" parameter.

    I created a grid that will show all the users of my system/application. In this application there is the usual button for a master file, "Add", "Edit", and "Delete" buttons. Now, I created new custom button named, "Change Password" which as the name implies it will be use for changing users passwords. The interchange or the dynamic show and hide of every object in form is now perfect, one thing where I'm having hard time to figure out is how can i change the "oper" parameter value when I submit the form of "Change Password" modal, coz' currently the value that the "oper" value has is "Add".

    How can I change the value "oper" parameter? There is a post that says I have to use serializeEditData, can you guide me on how can I use it with my custom button?

    Thanks in advance and hope to hear from you soon.

Sincerely,

    Romel C. Gomez