function expand(theDivName)
{
  var theDiv=getDiv(theDivName);
  if (null == theDiv || typeof(theDiv) == "undefined") return;
  theDiv.style.display = "block";
}

function collapse(theDivName)
{
  var theDiv=getDiv(theDivName);
  if (null == theDiv || typeof(theDiv) == "undefined") return;
  theDiv.style.display = "none";
}

function getDiv(theDivName){
  if (null == theDivName || typeof(theDivName) == "undefined") return null;
  return document.getElementById(theDivName); 
}