var fieldValue;

function onFocusField(fieldName,param)
{
  fieldValue = document.getElementById(fieldName).value;
  if(param == fieldValue) document.getElementById(fieldName).value = '';
  else document.getElementById(fieldName).value = fieldValue;
}

function onBlurField(fieldName,param1, param2)
{
  var Value;
  if(param1 == '')
    Value = param2;
  else
    Value = param1;
  document.getElementById(fieldName).value = Value;
}

function onClickField(fieldName,param)
{
  fieldValue = document.getElementById(fieldName).value;
  if(param == fieldValue) document.getElementById(fieldName).value = '';
  else document.getElementById(fieldName).value = fieldValue;
}