Windows need help with simple json-rpc script

Hi I have a powershell script that does some thing in the backround I would like it to send a msg to xbmc so that a msg would pop up on screen and say done for example.

Does any one have some sample code of how to do this ?

Ps my xbmc has a user name and password on the web interface and need to keep it ,for some other stuff i use.

Thank you for your time and help.

wget -Oz:\jsonrpc.log -q -T 1 -t 1 "http://username:password@192.168.0.50:8080/jsonrpc?request={\"jsonrpc\":\"2.0\",\"method\":\"GUI.ShowNotification\",\"params\":{\"title\":\"Download Complete\",\"message\":\"%1\"}}"

Where username is whatever username you're using, password is whatever password you're using. Change 192.168.0.50:8080 to whatever IP and port you're using and z:\jsonrpc.log to wherever you'd like the log file to be stored. When you call it, you can submit something like 'test.bat blah' and it will display "Download Complete: blah" on your tv screen.

Edit - fixed quotes