var collapseDivs, collapseLinks;

function createDocumentStructure (tagName) {
  if (document.getElementsByTagName) {
    var elements = document.getElementsByTagName(tagName);
    collapseDivs = new Array(elements.length);
    collapseLinks = new Array(elements.length);
    for (var i = 0; i < elements.length; i++) {
      var element = elements[i];
      var siblingContainer;
      if (document.createElement && (siblingContainer = document.createElement('div')) && siblingContainer.style) 
			  {
				var nextSibling = element.nextSibling;
				element.parentNode.insertBefore(siblingContainer, nextSibling);
				
				var nextElement = elements[i + 1];
						while (nextSibling != nextElement && nextSibling != null) 
						{
						  var toMove = nextSibling;
						  nextSibling = nextSibling.nextSibling;
						  siblingContainer.appendChild(toMove);
						}
				siblingContainer.style.display = 'none';
				
				collapseDivs[i] = siblingContainer;
				
				createCollapseLink(element, siblingContainer, i);
			  }
      else {
        // no dynamic creation of elements possible
        return;
      }
    }
    createCollapseExpandAll(elements[0]);
  }
}
/////////////////////////////////////////////////////////////////////////////////////////////////
function createCollapseLink (element, siblingContainer, index) {
  var span;
  if (document.createElement && (span = document.createElement('span'))) {
    span.appendChild(document.createTextNode(String.fromCharCode(160)));
    var link = document.createElement('a');
    link.collapseDiv = siblingContainer;
    link.href = '#';
	link.className = 'ec';
    link.appendChild(document.createTextNode('expand'));
    link.onclick = collapseExpandLink;
    collapseLinks[index] = link;
    element.parentNode.appendChild(link);
	span.appendChild(link);
	
    element.appendChild(span);
	
  }
}

function collapseExpandLink (evt) {
  if (this.collapseDiv.style.display == '') {
    this.parentNode.parentNode.nextSibling.style.display = 'none';
    this.firstChild.nodeValue = 'expand';
  }
  else {
    this.parentNode.parentNode.nextSibling.style.display = '';
    this.firstChild.nodeValue = 'collapse';
  }

  if (evt && evt.preventDefault) {
    evt.preventDefault();
  }
  return false;
}

function createCollapseExpandAll (firstElement) {
  var div;
  if (document.createElement && (div = document.createElement('div'))) {
    var link = document.createElement('a');
    link.href = '#';
	link.className = 'ec';
    link.appendChild(document.createTextNode('Show All Details'));
    link.onclick = expandAll;
    div.appendChild(link);
    div.appendChild(document.createTextNode('     '));
    link = document.createElement('a');
    link.href = '#';
	link.className = 'ec';
    link.appendChild(document.createTextNode('Hide All Details'));
    link.onclick = collapseAll;
    div.appendChild(link);
    firstElement.parentNode.insertBefore(div, firstElement);
  }
}

function expandAll (evt) {
  for (var i = 0; i < collapseDivs.length; i++) {
    collapseDivs[i].style.display = '';
    collapseLinks[i].firstChild.nodeValue = 'collapse';
  }
  
  if (evt && evt.preventDefault) {
    evt.preventDefault();
  }
  return false;
}

function collapseAll (evt) {
  for (var i = 0; i < collapseDivs.length; i++) {
    collapseDivs[i].style.display = 'none';
    collapseLinks[i].firstChild.nodeValue = 'expand';
  }
  
  if (evt && evt.preventDefault) {
    evt.preventDefault();
  }
  return false;
}