Someone

<script type="text/javascript"> 
 
function check(){ 
    var retVal = false; 
 
    var buttons = document.forms[0].customer_agree_terms; 
   for(var i = 0; i < buttons.length; i++)   { 
      if (buttons[i].checked == true){ 
         retVal = true; 
         break; 
      } 
   } 
   if(! retVal)   { 
      alert("FEL"); 
   } 
 
    return retVal; 
} 
 
</script>