function valOn(div) {
    var obj;
    var valDiv = new Array("add_val", "current_val", 
      "define_val", "custom_val");
    for (var i = 0; i < valDiv.length; i++) {
      if (valDiv[i] != div) {
        obj = document.getElementById(valDiv[i]);
        obj.style.display = "none";
        if (document.getElementById("li_"+valDiv[i])) {
          obj = document.getElementById("li_"+valDiv[i]);
          obj.className = "";
        }
      }
      else {
        obj = document.getElementById(valDiv[i]);
        obj.style.display = "block";
        obj = document.getElementById("li_"+valDiv[i]);
        obj.className = "highlight";
      }
    }
  }