Need help with post function

Hello,

I need help on how i can do this function below on a Captivate button? I believe it was used originally as Flash Action Script.

on (press) {

      var CourseId = "TR011970";

      var OwnerID = "12345";

      var RosterType = "INDIVIDUAL";

      getURL("http://roster.host.com/roster/RosterMain.cfm", "_blank", "POST"); }

Does anyone know how to do this in either Javascript or maybe Advance Actions?

thanks!