Question

I am available with the solution given by @Tomalak for MY QUESTION could you pls help me out with it as its giving me an error in firebug as : frm.creatorusers is undefined
[Break On This Error] var rdo = (frm.creatorusers.length >…rm.creatorusers : frm.creatorusers;
I used the code for validating radio button as:

function valDistribution(frm) {
var mycreator = -1;
        var rdo = (frm.creatorusers.length > 0) ? frm.creatorusers : frm.creatorusers; 
         for (var i=0; i<rdo.length; i++) {
         if (rdo[i].checked) {
         mycreator = 1;
            //return true;
          }
          }
          if(mycreator == -1){
          alert("You must select a Creator User!");
  return false;

          }

}

Answer 1

Here is how to use the code you were given by @Tomalak but did not copy correctly

function valDistribution(frm) { // frm needs to be passed here
  var myCreator=false;
// create an array if not already an array
  var rdo = (frm.creatorusers.length > 0) ? frm.creatorusers : [frm.creatorusers];  
  for (var i=0; i<rdo.length; i++) {
    if (rdo[i].checked) {
      myCreator=true;
      break; // no need to stay here
    }
    if (!myCreator){
      alert("You must select a Creator User!");
      return false;
    }
    return true; // allow submission
  }

assuming the onsubmit looking EXACTLY like this:
<form onsubmit="return valDistribution(this)">

and the radio NAMED like this:
<input type="radio" name="creatorusers" ...>