var TOC_CLASS_ACTIVE = "on3";

var TOC_CLASS_COLLAPSED = "toc-controller-closed";

var TOC_CLASS_EXPANDED = "toc-controller-open";

var TOC_CLASS_CONTROL = "toc-controller";

var TOC_CLASS_SPACE = "toc-space";

var TOC_DISPLAY_COLLAPSED = "none";

var TOC_DISPLAY_EXPANDED = "block";

/**

 * Check required support for TOC.

 */

function support() {

	if (document.getElementsByTagName && document.styleSheets) {

		tocSupported = true;

	} else {

		//alert("Dynamic TOC not available.");		

	}

}

/** Flag if dynamic TOC is supported */

var tocSupported = false;

support();

/** Current active TOC node. */

var currentHighlight = null;

/** Process start time stamp. */

var processStart;

/** Process end time stamp. */

var processEnd;

/** Last process duration. */

var processDuration

/**

 * Hightlight TOC node.

 *

 * @param node TOC node to highlight

 */

function highlightTocItem(node) {

	if (tocSupported) {

		// turn old off

		if (currentHighlight === null || !isClass(currentHighlight, TOC_CLASS_ACTIVE)) {

			// turn all off

			var li = getFirstElementByClassName(node.ownerDocument, TOC_CLASS_ACTIVE, TOC_ITEM);

			if (li !== null) {

			  removeClass(li, TOC_CLASS_ACTIVE);

			}

		} else {

			removeClass(currentHighlight, TOC_CLASS_ACTIVE);

		}

		// turn this on

		addClass(node.parentNode, TOC_CLASS_ACTIVE);

		currentHighlight = node.parentNode;

	}

}

/**

 * Toggle child node display.

 *

 * @param n Target node of the event.

 */

function toggle(n) {

	if (isClass(n, TOC_CLASS_EXPANDED)) {

		tocNodeCollapse(n);

	} else {

	  tocNodeExpand(n);

	}

}

/**

 * Expand TOC node.

 *

 * @param n TOC node

 */

function tocNodeExpand(n, collapseOverride) {

  if (collapseOverride === undefined) {

    collapseOverride = true;

  }

  n.firstChild.data = TOC_SYMBOL_EXPANDED;

  switchClass(n, TOC_CLASS_EXPANDED, TOC_CLASS_COLLAPSED);

  var ul = getNextSiblingByTagName(n.nextSibling, TOC_ELEMENT_BLOCK);

  if (ul !== null) {

    if (childCollapse && collapseOverride) {

      var li = getChildElementsByTagName(ul, "li");

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

        collapseChildBlocks(li[i]);

      }

    }

    ul.style.display = TOC_DISPLAY_EXPANDED;

    //switchClass(ul, "toc-expanded", "toc-collapsed");

  }

}

/**

 * Collapse TOC node.

 *

 * @param n TOC node

 */

function tocNodeCollapse(n) {

  n.firstChild.data = TOC_SYMBOL_COLLAPSED;

  switchClass(n, TOC_CLASS_COLLAPSED, TOC_CLASS_EXPANDED);

  var ul = getNextSiblingByTagName(n.nextSibling, TOC_ELEMENT_BLOCK);

  if (ul !== null) {

    ul.style.display = TOC_DISPLAY_COLLAPSED;

    //switchClass(ul, "toc-collapsed", "toc-expanded");

  }

}

/**

 * Signal start of processing.

 *

 * @param message Message description of the process start

 */

function startProcess(message) {

    processStart = new Date();

    window.status = (message === undefined ? "" : message);    

}

/**

 * Signal end of processing.

 *

 * @param message Message description of the process result

 */

function endProcess(message) {

    processEnd = new Date();

    window.status = (message === undefined ? "" : message);

    processDuration = processEnd - processStart;

}