var selectedQ;
var selectedID = "false";

function showAnswer(id,obj){
    document.getElementById("a-placeholder").style.display = "none";
    if(selectedID != "false") document.getElementById(selectedID).style.display = "none";
    selectedID = "a-answer-" + id;
    document.getElementById(selectedID).style.display = "block";
    
    if(selectedQ) selectedQ.className = "";
    selectedQ = obj;
    obj.className = "selected";
}