var selectedanswer = -1;
function showAnswer(id)
{
 var s = null;
 var selectedimage = document.getElementById("image" + selectedanswer);
 if (selectedimage != null)
 {
 selectedimage.src = 'img/arrow_right.gif';
 s = document.getElementById('answerrow' + selectedanswer);
 if ( s != null )
 s.style.display = 'none';
 else
 alert('cannot close ' + 'answerrow' + selectedanswer);
 }
 if(selectedanswer != id) {
 var image = document.getElementById("image" + id)
 if( image != null){
 image.src = 'img/arrow_down.gif' ;
 }

 s = document.getElementById('answerrow' + id);
 if ( s!= null)
 s.style.display = 'block';
 else
 alert('cannot open ' + 'answerrow' + id);
 selectedanswer = id;
 } else { selectedanswer = -1; }
}

function hideSubSubjects(){
 var el = document.getElementById("subsubjects");if(el != null){el.style.display = "none";}

}
function showSubSubjects(){
 var el = document.getElementById("subsubjects");if(el != null){
 var tel = document.getElementById("qatable");
 el.style.display = "block";
 }
}
function changeSubject(objSelect)
{ var val = objSelect.value;
 switch(val)
 {
 case '12680000000002':
 hideSubSubjects();
 break;
 case '12680000000003':
 showSubSubjects();
 break;
 case '12680000000026':
 showSubSubjects();
 break;

 default:
 // nop ...
 break;
 }
}