Java script for radio button values

Hi, I am creating a questionnaire using radio buttons, but I can't seem to get the script to work (the script below works perfectly for a checkbox button), the client wants to change the checklist to a radio button, I tried changing the script below from "checklist" to "radiobutton"but this didn't seem to work. In the pdf I have made all the field names etc exactly the same except it is now a radio button not a check box. Is it possible to get some help with the script below? Thank you.

{

var temp = 0;

  for(var i = 0; i < this.numFields; i++)

  {

    var name = this.getNthFieldName(i);

    var field = this.getField(name);

    if (field.type == "checklist" && field.value != "Off")

    {

      temp += field.value;

    }

  }

  this.getField("Total Score").value = temp;

  var f = this.getField("Risk");

  if (temp>=5 && temp <=24){

      var g = this.getField(f.name+".0");

      g.defaultIsChecked(0,true);

  }

  if (temp>=25 && temp <=39){

      var g = this.getField(f.name+".1");

      g.defaultIsChecked(0,true);

  }

  if (temp>=40 && temp <=54){

      var g = this.getField(f.name+".2");

      g.defaultIsChecked(0,true);

  }

  if (temp>=55 && temp <=64){

      var g = this.getField(f.name+".3");

      g.defaultIsChecked(0,true);

  }

  if (temp>=65 && temp <=75){

      var g = this.getField(f.name+".4");

      g.defaultIsChecked(0,true);

  }

  this.resetForm(["Risk"]);

}