//for twisties
function showHideContent(id){
  var divID = document.getElementById(id);
  var idNum = id.substring(3,5);
  var thisImage = document.getElementById("myImage" + idNum)
  if (divID.style.display == 'block') {
      divID.style.display = 'none';
	  if(thisImage){
	    thisImage.src='http://www.learnerstogether.net/images/twist.gif'
 	  }
  } else {
     divID.style.display = 'block';
	 if(thisImage){
      thisImage.src='http://www.learnerstogether.net/images/twist_dn.gif'
	 }
  }
}