function formatSSN(mss)
{
     var theCount = 0;
     var theString = mss.value;
     var newString = "";
     var myString = theString;
     var theLen = myString.length;
     for ( var i = 0 ; i < theLen ; i++ )
     {
     // Character codes for ints 1 - 9 are 48 - 57
          if ( (myString.charCodeAt(i) >= 48 ) && (myString.charCodeAt(i) <= 57) )
          newString = newString + myString.charAt(i);   
     }
// Now the validation to determine that the remaining string is 9 characters.
     if (newString.length == 9 )
     {
// Now the string has been stripped of other chars it can be reformatted to ###-##-#### 
          var newLen = newString.length;
          var newSSN = "";
          for ( var i = 0 ; i < newLen ; i++ )
          {
               if ( ( i == 2 ) || ( i == 4 ) )
               {
                    newSSN = newSSN + newString.charAt(i) + "-";
               }else{
                    newSSN = newSSN + newString.charAt(i);
               }
          }
          mss.value = newSSN;
          return true;
     }else{
          alert("El Numero de Seguro Social que entro: "+newString+" no es valido");
          mss.focus();
          return false;
     }
}