var ELEMENT_NODE = 1; 
var ATTRIBUTE_NODE = 2; 
var TEXT_NODE = 3; 
var CDATA_SECTION_NODE = 4; 
var ENTITY_REFERENCE_NODE = 5;
var ENTITY_NODE = 6;
var PROCESSING_INSTRUCTION_NODE = 7;
var COMMENT_NODE = 8;
var DOCUMENT_NODE = 9;
var DOCUMENT_TYPE_NODE = 10;
var DOCUMENT_FRAGMENT_NODE = 11;
var NOTATION_NODE = 12;

/*
  Function Name: AttachEvent
  Arguments: OBJ,EVT,FNCT
  Action: cross browser: attaches event to passed in object.  FNCT will be the event's callback function.
  Returns: true on success
*/
function AttachEvent(OBJ,EVT,FNCT)
{
  if (OBJ.addEventListener)
  {
    OBJ.addEventListener(EVT,FNCT,true);
    return true;
  } 
  else if (OBJ.attachEvent) 
  {
    return OBJ.attachEvent("on"+EVT,FNCT);
  }
}

/*
  Function Name: RemoveTextNodes
  Arguments: NODE
  Action: Removes all child "empty" text nodes from an element. Allows for recursive removal.
  Returns: nothing
  Notes: The purpose of this function it to equalize the Mozilla and IE DOMs.
*/ 
function RemoveTextNodes(NODE,RECURSIVE)
{
  var ChildNode;
  for (var i=NODE.childNodes.length-1; i>=0; i--)
  {
    ChildNode = NODE.childNodes[i];
    if (ChildNode.nodeType == TEXT_NODE && !(/\S/.test(ChildNode.nodeValue)))
    {
      NODE.removeChild(ChildNode);
    }
    else if (RECURSIVE && ChildNode.hasChildNodes())
    {
      RemoveTextNodes(ChildNode,true);
    }
  }
}
/*
  Function Name: GetElementsByClassName
  Arguments: CLASS,NODE
  Action: Finds all elements that are descendants of NODE of the CLASS class.
  Returns: an array of elements that are descendants of NODE of the CLASS class
*/ 
function GetElementsByClassName(CLASS,NODE) {
  var startNode = NODE || document;
  var AllTags = startNode.getElementsByTagName("*");
  if (AllTags.length == 0) AllTags = startNode.all; //for IE
  var Elems = new Array();
  var re = new RegExp("(^|\\s+)" + CLASS + "(\\s+|$)");
  for (var i=0; i<AllTags.length; i++)
  {
    if (re.test(AllTags[i].className)) Elems[Elems.length] = AllTags[i];
  }
  return Elems;
}
/* GB: added functions below this line */
/*
        Function Name: RemoveElement
        Arguments: ELEM
        Action: Removes passed-in element
        Returns: true on success, false on failure
*/
function RemoveElement(ELEM)
{
        if (ELEM.parentNode.removeChild(ELEM))
                return true;
        else
                return false;
}

/*
        Function Name: RemoveAllChildren
        Arguments: PARENT
        Action: Removes all of an element's children
        Returns: nothing
*/
function RemoveAllChildren(PARENT)
{
  while (PARENT.hasChildNodes()) {
    PARENT.removeChild(PARENT.childNodes[0]);
  }
}