Code to pass parameter and fire sub from another page.

I learn demo from here.
http://demos.telerik.com/aspnet-ajax/window/examples/dialogreturnvalue/defaultvb.aspx?show-source=true
JS code to pass parameters from pop-up page to main page.
Question:
How to modify code (JS code or code behind page) to pass parameters and fire one sub in main page which will take parameters and update some data?