Dreamweaver Radio Button Validation Question

I am working on a form where the user has to select one of two button on 27 different items.  I keep get a debug error on my JavaScript and I can't figure out what I'm missing.  Here is my code (I have commented out some lines in the middle when the first variable value would not pass).  HELP (if possible):

//JavaScript Document
function frmValidate(rdo1, rdo2, frm)

      //beginning of how to alert user with two line breaks at end for a double space
      
      var errAlert = "The Following are required:\n\n";
      
      // counter to let you know how man errors exist...no alert if no error present
      
      var errCt = 0;
      
      for (var i=0; i< 4; i++)
      {
            if (frm(rdo1)[i].checked)
            {
                  errAlert = ""
                  errCt = 0;
                  break;
                  
            }
            else
            {
                  //if there is an error, let's add one to the count
                  errCt = errCt +1;
            }
      }
      
      if (errCt > 0)
      {
            errAlert = errAlert + "-- Question 1" + "\n"
      }
      
      /*errCt = 0
      for (var j=0; j<=3; j++)
      {
            if (document.getElementByID(rdo2).checked ==true)
            {
                  errAlert = ""
                  errCt = 0;
                  
                  return true;
                  break;
            }
            else
            {
                  //if there is an error, let's add one to the count
                  errCt = errCt +1;
            }
      }
      if (errCt > 0)
      {
            errAlert = errAlert + " -- Question 2" + "\n"
      }
      */
      
            if (errCt > 0)
            {
                  //if the error count is greater than zero, then let's alert the user of what he/she missed.
                  alert(errAlert);
                  return false;
            }
            
            return true;
      }