function doClick(xx)  
{
  var myForm = document.createElement('form');
  myForm.action="index.html";
  myForm.method="POST";
  myForm.target="_self";
  myForm.style.display="none";
  myVar = document.createElement('input');
  myVar.type="text";
  myVar.name="x";
  myVar.value=xx.id;
  myForm.appendChild(myVar);
  document.body.appendChild(myForm);
  myForm.submit();
};