function expandorcontract(sel) {
  var sel_class = document.getElementById("div"+sel).className;
  if (sel_class == "hide") {
    document.getElementById("div"+sel).className="show";
    document.getElementById("plus"+sel).innerHTML="-";
  } else { 
    document.getElementById("div"+sel).className="hide";
    document.getElementById("plus"+sel).innerHTML="+";
  }
}