Blue Static

/*=====================================================================*
|| ###################################################################
|| # Blue Static ISSO Framework
|| # Copyright (c)2005-2008 Blue Static
|| #
|| # This program is free software; you can redistribute it and/or modify
|| # it under the terms of the GNU General Public License as published by
|| # the Free Software Foundation; version 2 of the License.
|| #
|| # This program is distributed in the hope that it will be useful, but
|| # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|| # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|| # more details.
|| #
|| # You should have received a copy of the GNU General Public License along
|| # with this program; if not, write to the Free Software Foundation, Inc.,
|| # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|| ###################################################################
\*=====================================================================*/

function nav_init(openSectionID, selectedItemID)
{
	var nav 			= document.getElementById("nav");
	var openSection		= document.getElementById(_name(openSectionID));
	var selectedItem	= document.getElementById(_name(selectedItemID));

	// open the proper nav section
	if (openSection)
	{
		openSection.className = "expand";
		_adjacent_ul(openSection).style.display = "block";
	}

	// bold the selected link
	if (selectedItem)
		selectedItem.className = "selected";

	// register the nav sections
	var sections = nav.getElementsByTagName("ul");
	sections = sections[0].childNodes;
	for (var i = 0; i < sections.length; i++)
	{
		// grab only <li> elements that do not have an <ul> in them
		if (sections[i].nodeName.toLowerCase() == "li" && sections[i].childNodes.length == 1)
			sections[i].onclick = nav_toggle;
	}
}

function nav_toggle()
{
	// we have a class name, so we need to hide
	if (this.className)
	{
		this.className = "";
		_adjacent_ul(this).style.display = "none";
	}
	// show the block
	else
	{
		this.className = "expand";
		_adjacent_ul(this).style.display = "block";
	}
}

function _name(str)
{
	return "nav_" + str;
}

function _adjacent_ul(elm)
{
	// <li> + #text + <li> > #text == <ul>
	return elm.nextSibling.nextSibling.firstChild.nextSibling;
}