function displayChgt(key) {
   var displayBlock = document.getElementById("chgtblock_" + key);
   var displaySpan = document.getElementById("chgtbox_" + key);
   var currentDisplay = displayBlock.style.display;
   var displayed = (currentDisplay == "block");
   var newDisplay;
   var newCurrentValueDisplay;
   var newDisplaySpanText;
   if (displayed) {
      newDisplay="none";
      newDisplaySpanText="+";
      newCurrentValueDisplay = "block";
   }
   else {
      newDisplay="block";
      newDisplaySpanText="-";
      newCurrentValueDisplay = "none";
   }
   displayBlock.style.display= newDisplay;
   displaySpan.firstChild.data = newDisplaySpanText;
  // document.getElementById("current_" + key).style.display=newCurrentValueDisplay;
}