gToc = null ;

instanciateToc = function() {

  gToc = {

      'tocId':CY.guid(),

      'tocTitleId':CY.guid(),

      'closeBtnId':CY.guid(),

      'empty': false

  } ;

  var overlayHtml = {};

  overlayHtml['headerContent'] = '<div id="' + gToc['tocId'] + '"><h3 id="' + gToc['tocTitleId'] + '"></h3>';

  var toBeTOCced = getElementsByTagNames('h2,h3,h4,h5,h6', document.getElementById('maincontainer'));

  var content = document.createElement('div');

  if (toBeTOCced.length >= 2) {

    for (var i=0;i<toBeTOCced.length;i++) {

	  	var tmp = document.createElement('a');

		  tmp.innerHTML = toBeTOCced[i].innerHTML.replace(/<\/?a[^>]*>/g,'');

  		tmp.className = 'page indent' + toBeTOCced[i].nodeName;

	  	content.appendChild(tmp);

		  var headerId = toBeTOCced[i].id || 'link' + i;

  		tmp.href = '#' + headerId;

	  	toBeTOCced[i].id = headerId;

    }

  }

  else {

    content.innerHTML = '';

    gToc['empty'] = true;

  }

  overlayHtml['bodyContent'] = content.innerHTML;

  var width = gLayout.getTopICommentsWidth() ;

  var overlay = new CY.Overlay( {

    zIndex :3,

    shim :false, // until we really need it, no shim 

    visible :false,

    headerContent :overlayHtml['headerContent'],

    bodyContent :overlayHtml['bodyContent'],

    xy :[3,30],

    width : width

  });

  overlay.get('contentBox').addClass("c-toc") ;

  overlay.get('contentBox').set("id", "the-toc") ;

  // attach to DOM

  overlay.render('#leftcolumn');

  CY.get("#"+gToc['tocTitleId']).set('innerHTML', gettext('Table of contents')) ;

  gToc['overlay'] = overlay ;

  var animationHide = null ;

  animationHide = new CY.Anim({

        node: overlay.get('boundingBox'),

        duration: .3, //gPrefs['general']['animduration'],

        easing: CY.Easing.easeOut

    });   

  gToc['animationHide'] = animationHide ; 

  animationHide.set('to', { opacity: 0});// height : 0 doesn't work

  gToc['animationHide-handle'] = animationHide.on('end', onTocHideAnimEnd, gToc);

  var animationShow = null ;

  animationShow = new CY.Anim({

        node: overlay.get('boundingBox'),

        duration: .3, //gPrefs['general']['animduration'],

        easing: CY.Easing.easeOut

    });   

  gToc['animationShow'] = animationShow ; 

  animationShow.set('to', { opacity: 1});

  gToc['animationShow-handle'] = animationShow.on('end', onTocShowAnimEnd, gToc);

}

toggleTocFn = function() {

  if (isTocVisible())

    hideToc();

  else

    showToc();

}

hideToc = function() {

  gToc['overlay'].hide();

}

onTocHideAnimEnd = function() {

//  iComment['overlay'].blur() ;

  this.overlay.hide() ;

  gSync.resume() ;    

}

onTocShowAnimEnd = function() {

  gSync.resume() ;    

}

showToc= function () {

  removeFormErrMsg(gToc['tocId']) ;

  gIComments.hide() ;

  gToc['overlay'].show();

}

isTocVisible = function () {

  if (gToc != null)

    return gToc['overlay'].get('visible') ;

  return false ;

}

function getElementsByTagNames(list,obj) {

	if (!obj) var obj = document;

	var tagNames = list.split(',');

	var resultArray = new Array();

	for (var i=0;i<tagNames.length;i++) {

		var tags = obj.getElementsByTagName(tagNames[i]);

		for (var j=0;j<tags.length;j++) {

			resultArray.push(tags[j]);

		}

	}

	var testNode = resultArray[0];

	if (!testNode) return [];

	if (testNode.sourceIndex) {

		resultArray.sort(function (a,b) {

				return a.sourceIndex - b.sourceIndex;

		});

	}

	else if (testNode.compareDocumentPosition) {

		resultArray.sort(function (a,b) {

				return 3 - (a.compareDocumentPosition(b) & 6);

		});

	}

	return resultArray;

}