function expandList(list){
var listElementStyle=document.getElementById(list).style;
if (listElementStyle.display=="none"){
  listElementStyle.display="block";
}else {
  listElementStyle.display="none";
  }
}
function changeClass(list){
var listElementClass=document.getElementById(list).className;
if (listElementClass=="plus") {
document.getElementById(list).setAttribute("class", "minus");
} else {
document.getElementById(list).setAttribute("class", "plus");
}
}