function handleEnter(field, event) {
  var keyCode = 
    event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
  if(keyCode == 13) {
    var index;
    for (index = 0; index < field.form.elements.length; ++index)
      if (field == field.form.elements[index]) 
	break;
    index = (index + 1) % field.form.elements.length;
    field.form.elements[index].focus();
    return false;
  } else {
    return true;
  }
}      


function handleSubmit (field, event, actionString) {
  var keyCode = 
    event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
  
  if(keyCode == 13){
    window.eval(actionString);
    return false;
  } else {
    return true;
  }
}