/* Javascript function TextCounter.
   Purpose: Realtime counting of how many characters are left to fill out in an
	          input or message field. 
*/ 

function textCounter(field, countfield, maxchar) {
  // Trim the message if it is too long.
  if (field.value.length > maxchar)
    field.value = field.value.substring(0, maxchar);
  // Update the counter.
  else
    countfield.value = maxchar - field.value.length;
}