function show(no){
  var Obj=eval("sm" + no);
  var tempColl = document.getElementsByTagName("div");
  for(i=0; i<tempColl.length; i++) {
    if ((tempColl(i).id != Obj.id) && ((tempColl(i).className == "cl sm"))) {  
      tempColl(i).style.display = "none";
	}   
  }
  if(Obj.style.display=="none") {
    Obj.style.display="";
  } else {
    Obj.style.display="none";
  }
}

function change(obj1,obj2,no,class1,class2,n){
  for(i=1; i<n+1; i++) {
    if (i == no) {  
      document.getElementById(obj1+no).className = class1;
	  document.getElementById(obj2+no).style.display = "";
	} else {
      document.getElementById(obj1+i).className = class2;
	  document.getElementById(obj2+i).style.display = "none";		
	}
  }
}

function showAnswer(obj) {
  var tempObj = document.getElementById(obj);
  if(tempObj.style.display == "none") {
    tempObj.style.display = "";
  } else {
    tempObj.style.display = "none";
  }  
}