function doEmpty(el)
{
  v = el.getAttribute('didEmpty');
  if(v!=='1')
  {
    el.setAttribute('firstValue', el.value);    
    el.setAttribute('didEmpty', '1');
    if(el.attachEvent)
    {
      el.attachEvent('onblur', function() {doBlur(el)});
    }else if(el.addEventListener)
    {
      el.addEventListener('blur', function() {doBlur(el)}, false);
    }

  }
  if(el.value == el.getAttribute('firstValue'))
  {
    el.value = '';
  }
  el.style.color = 'black';
}
function doBlur(el)
{
  if(el.value == '')
    el.value = el.getAttribute('firstValue');
  
  el.style.color = '';
}