function onComplete(obj) {
  $("results-div").style.display = "block";
  $("results-div").style.visibility = "visible";
}

function resetForm(obj) {
  $("results-div").style.display = "none";
  $("results-div").style.visibility = "hidden";
  $('rdfa-html').value = '';
}

function extract() {
  var service = '/services/rdfa/';
  var content = $F('rdfa-html')
  var url = $F('rdfa-url')
  var pars = '';
  var method = 'get';
  if(content && content.length != 0) {
    pars = 'contents='+escape(content)+"&output=html";
    method = 'post';
  } else {
    pars = 'url='+escape(url);
  }
  new Ajax.Updater('results', service, {  method: method,  parameters: pars, "onComplete" : onComplete});
}