function showdetails(index) 
{
  var display='';
  var txttabname='txt_tab'+index;
  
 
  if(document.getElementById(txttabname).value=='block')
  {
	display='none';
  }
  else
  {
	display='block';
  }
  
  document.getElementById('faq_tab'+index).style.display=display;
  document.getElementById('txt_tab'+index).value=display;
}