/*

	YADM - Yet another dynamic menu

	written by Chris Heilmann (http://icant.co.uk)

	Please refer to the yadm homepage for updates: http://www.onlinetools.org/tools/yadm/

	Free for non-commercial use. Changes welcome, but no distribution without 

	the consent of the author.

*/

function yadm()

{



// Variables, change these in case you need to set other class names (mmhide_ for 

// contribute users for example)

	var parentClass='isParent';				//gets applied when the LI has a nested UL

	var activeParentClass='isActive';		//gets applied when the nested UL is visible

	var preventHoverClass='nohover';		//denotes a navigation that should not get any hover effects

	var indicateJSClass='dhtml';			//gets applied to the main navigation when Javascript is available

	var toHideClass='hiddenChild';			//gets applied to hide the nested UL

	var toShowClass='shownChild';			//gets applied to show the nested UL

	var currentClass='current';				//denotes the current active sub element and prevents collapsing

	var d=document.getElementById('nav');	//denotes the navigation element 



// if DOM is not available stop right here.

	if(!document.getElementById && !document.createTextNode){return;}



// if the navigation element is available, apply the class denoting DHTML capabilities

	if(d)

	{

		d.className+=d.className==''?indicateJSClass:' '+indicateJSClass;

		var lis,i,firstUL,j,apply;



// loop through all LIs and check which ones have a nested UL

		lis=d.getElementsByTagName('li');

		for(i=0;i<lis.length;i++)

		{

			firstUL=lis[i].getElementsByTagName('ul')[0]

// if there is a nested UL, deactivate the first nested link and apply the class to show 

// there is a nested list

			if(firstUL)

			{

				//lis[i].childNodes[0].onclick=function(){return false;}

				lis[i].className+=lis[i].className==''?parentClass:' '+parentClass;

// check if there is a "current" element 

				apply=true;

				if(new RegExp('\\b'+currentClass+'\\b').test(lis[i].className)){apply=false;}

				if(apply)

				{

					for(j=0;j<firstUL.getElementsByTagName('li').length;j++)

					{

						if(new RegExp('\\b'+currentClass+'\\b').test(firstUL.getElementsByTagName('li')[j].className)){apply=false;break}

					}

				}

// if there is no current element, apply the class to hide the nested list

				if(apply)

				{

					firstUL.className+=firstUL.className==''?toHideClass:' '+toHideClass;

// check if there is a class to prevent hover effects and only apply the function

// onclick if that is the case, otherwise apply it onclick and onhover

					if(new RegExp('\\b'+preventHoverClass+'\\b').test(d.className))

					{

						lis[i].onclick=function(){doyadm(this);}

					} else {

						lis[i].onclick=function(){doyadm(this);}

						lis[i].onmouseover=function(){doyadm(this);}

						lis[i].onmouseout=function(){doyadm(null);}

					}

// if there is a current element, define the list as being kept open and apply the 

// classes to show the nested list and define the parent LI as an active one

				} else {

					lis[i].keepopen=1;

					firstUL.className+=firstUL.className==''?toShowClass:' '+toShowClass;

					lis[i].className=lis[i].className.replace(parentClass,activeParentClass);

				}

			}

		}

	}

// function to show and hide the nested lists and add the classes to the parent LIs

	function doyadm(o)

	{

		var childUL,isobj,swap;



// loop through all LIs of the navigation		

		lis=d.getElementsByTagName('li');

		for(i=0;i<lis.length;i++)

		{

			isobj=lis[i]==o;

// function to exchange class names in an object

			swap=function(tmpobj,tmporg,tmprep)

			{

				tmpobj.className=tmpobj.className.replace(tmporg,tmprep)		

			}

// if the current LI does not have an indicator to be kept visible

			if(!lis[i].keepopen)

			{

				childUL=lis[i].getElementsByTagName('ul')[0];

// check if there is a nested UL and if the current LI is not the one clicked on

// and exchange the classes accordingly (ie. hide all other nested lists and 

// make the LIs parent rather than active.

				if(childUL)	

				{	

					if(new RegExp('\\b'+preventHoverClass+'\\b').test(d.className))

					{

						if(new RegExp('\\b'+activeParentClass+'\\b').test(lis[i].className))

						{

							swap(childUL,isobj?toShowClass:toHideClass,isobj?toHideClass:toShowClass);		

							swap(lis[i],isobj?activeParentClass:parentClass,isobj?parentClass:activeParentClass);		

						} else {

	

							swap(childUL,isobj?toHideClass:toShowClass,isobj?toShowClass:toHideClass);		

							swap(lis[i],isobj?parentClass:activeParentClass,isobj?activeParentClass:parentClass);		

						}

					} else {

							swap(childUL,isobj?toHideClass:toShowClass,isobj?toShowClass:toHideClass);		

							swap(lis[i],isobj?parentClass:activeParentClass,isobj?activeParentClass:parentClass);		

					}

				} 

			}

		}

	}

}

window.onload=function()

{

	yadm();

	// add other functions to be called onload below

}