function expcol(divIDpartial) {
  var closeditemID = 'xc'+divIDpartial;
  var openeditemID = 'xo'+divIDpartial;

  var closeditem = document.getElementById(closeditemID);
  var openeditem = document.getElementById(openeditemID);

  if (closeditem) {
    closeditem.className=(closeditem.className=='exmhide')?'exmshow':'exmhide';
  }
  if (openeditem) {
    openeditem.className=(openeditem.className=='exmhide')?'exmshow':'exmhide';
  }
}