function ClearListBox(AListBox)
{
  for (i = AListBox.options.length - 1; i >= 0; i--)
    AListBox.options[i] = null;
}

function HideCtl(ctl) {
  ctl.style.visibility = 'hidden';
  ctl.style.display = 'none';
}

function ShowCtl(ctl) {
  ctl.style.visibility = 'visible';
  ctl.style.display = 'block';
}

function DisableCtl(ctl) {
  ctl.disabled = true;
}

function EnableCtl(ctl) {
  ctl.disabled = false;
}

function SetCtlClass(ctlID, ctlClass) {
  var ctl = document.getElementById(ctlID);
  if (ctl) {
    ctl.setAttribute('class', ctlClass);
    ctl.setAttribute('className', ctlClass);
  }
}

function HideDivBlock(divCtl) {
  divCtl.style.visibility = 'hidden';
  divCtl.style.display = 'none';
}

function ShowDivBlock(divCtl) {
  divCtl.style.visibility = 'visible';
  divCtl.style.display = 'block';
}

function ShowDivBlockInline(divCtl) {
  divCtl.style.visibility = 'visible';
  divCtl.style.display = 'inline';
}

function SetDivContent(divName, divContent) {
  var div = document.getElementById(divName);
  if (divContent == '') {
    div.innerHTML = '';
//    HideDivBlock(div);
  }
  else {
    div.innerHTML = divContent;
//    ShowDivBlock(div);
  };
}