PHONE DASH FILL
<script>
        /* <![CDATA[ */
     var CustomEventHandlers = {
       setup: function (el) {
           if (CustomView.hasClass(el, 'PhoneInsert')) {
               FEvent.observe(el, 'keydown', this.formatPHONE.bindAsObserver(this, el));
               FEvent.observe(el, 'keyup', this.formatPHONE.bindAsObserver(this, el));
           }

       },

       formatPHONE: function (event, element) {
           if (event.keyCode != 46 && event.keyCode != 8) {
               fldVal = $(element).value;
               var nom = fldVal.charAt(fldVal.length - 1);
               if (isNaN(nom) && nom != "-") {
                   $(element).value = fldVal.substring(0, fldVal.length - 1);
               } else {
                   if ((fldVal.length == 3) || (fldVal.length == 7)) {
                       $(element).value = fldVal + "-";
                   }
                   if (fldVal.length > 12) {
                       $(element).value = fldVal.substring(0, fldVal.length - 1);
                   }
               }
           }
       }
   }
  
/* ]]> */
    </script>