function validate_radio(option_name,err_msg_div){
  radios = document.getElementsByName(option_name);
  var checked = false;
  for (i = 0; i < radios.length; i++){
  	if(radios[i].checked){
    	var sel_opt = radios[i].value;
      checked = true;
    }
  }
  if(!checked){
  	document.getElementById(err_msg_div).innerHTML = "Please select an option";
    return false;
  }else{
    return true;
  }
}