/** 
    This function displays all the subtopics associated contained in container with given talkbackId
**/
function showTalkback(talkbackId){
    var divTalkback = document.getElementById(talkbackId);
    divTalkback.style.display = 'block';
}

/** 
    This function hides all the subtopics associated contained in container with given talkbackId
**/

function hideTalkback(talkbackId){
    var divTalkback = document.getElementById(talkbackId);
    divTalkback.style.display = 'none';
}

/** 
    This function toggles display of the subtopics associated contained in container with given talkbackId
**/

function toggleTalkback(talkbackId){
    var divTalkback = document.getElementById(talkbackId);
    if(divTalkback.style.display == 'none') showTalkback(talkbackId);
    else hideTalkback(talkbackId);
}