Validate radio group

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Javascript

Using this script I want to validate a radio group and when the error message comes up I want the cursor to go the radio input that is in error. Instead it resets the form. Could you tell me where my code has gone wrong?

theForm.Cover_Style.focus();

is what i added.

var radioSelected = false;
for (i = 0;  i < theForm.Cover_Style.length;  i++)
   {
   if (theForm.Cover_Style[i].checked)
      radioSelected = true;
   }
if (!radioSelected)
   {
   alert("Please select a \"Cover Style (Soft Cover or Hard Cover)\.");
   theForm.Cover_Style.focus();
   return (false);
   }

[edit]Subject - Try to describe your problem briefly. "Beginner needs help" doesn't help us decide if we know about your problem before we take the time to open the link.
Code block add to improve readability - OriginalGriff[/edit]