if(window.addEventListener){
	window.addEventListener('load', sitemap, false); 
	window.addEventListener('load', readPrefs, false); 
}else{
	window.attachEvent('onload', function(){
		sitemap();
		readPrefs();
		})
}

//			:::		START MAKE SITEMAP INTERACTIVE	:::

function sitemap(){
	// grab all h2 elements
	var h = document.getElementById('content').getElementsByTagName('h2');
	// grab all unordered lists
	var u = document.getElementById('content').getElementsByTagName('ul');
	
	for(i=0;i<u.length;i++){
		// hide all unordered lists with 'sitemap' class
		if(u[i].className == 'sitemap'){
			u[i].style.display = 'none';
		}
		
		// get all links
		var a = u[i].getElementsByTagName('a');
		for(z=0;z<a.length;z++){
			// checks if link has a class of 'parent'
			if(a[z].className == 'parent'){
				var li = a[z].parentNode;
				
				// creates maximise.gif element if it doesn't already exist
				var imgChk = li.getElementsByTagName('img');
				if(imgChk.length == 0){
					var img = document.createElement('img');
						img.className = 'icon';				
						img.src = 'images/maximise.gif';
						img.style.verticalAlign = 'middle';					
					li.insertBefore(img, a[z]);
				}

				// set style
				li.className = 'parent';
				
				//hide child unordered list
				ul = a[z].nextSibling;
				while (ul.nodeType != 1){
					ul = ul.nextSibling;
				}
				
				ul.style.display = 'none';
				
				// make clicking new image hide/show child unordered list
				img.onclick = function(){
					li = this.parentNode;					
					ul = li.getElementsByTagName('ul')[0];
					var ulStatus = (ul.style.display == 'none') ? 'block' : 'none';
					ul.style.display = ulStatus;
					
					// toggle between maximise.gif and minimise.gif					
					imgStatus = (ulStatus == 'block') ? 'minimise' : 'maximise';
					this.src = 'images/' + imgStatus + '.gif';
				}
			}
		}
		
	}
	
	for(x=0;x<h.length;x++){
		// assign unique IDS to each h2 element
		h[x].id = 'h2' + x;
		h[x].className = 'maximise';
		
		// make h2 element show/hide unordered list when clicked
		h[x].onclick = function(){
			var ul = this.nextSibling;
			
			while (ul.nodeType != 1){
				ul = ul.nextSibling;
			}
			
			var ulStatus = (ul.style.display == 'none') ? 'block' : 'none';
			
			ul.style.display = ulStatus;
			var hStatus = (ulStatus == 'block') ? 'minimise' : 'maximise';
			this.className = hStatus;
			
			// set cookie
			return writePrefs(this.id,ulStatus);
		}
	}
}

//			:::		END MAKE SITEMAP INTERACTIVE	:::

//			:::		START WRITE HIDE/SHOW COOKIE :::

function writePrefs(section,tf){
	var cookieName = section;
	var today = new Date();
	var expires = new Date(today.getTime() + 10*24*60*60*1000);
	var index = (document.cookie != document.cookie) ? document.cookie.indexOf(cookieName) : -1; 

	if (document.cookie){ 
		var index = document.cookie.indexOf(cookieName); 
		if (index != -1) { 
			var namestart = (document.cookie.indexOf("=", index) + 1); 
			
			if (document.cookie.substring(namestart) == tf){
				return false;
			}		
		} 
	} 
	
	document.cookie= section + " = " + tf + "; expires=" + expires.toGMTString();
}

//			::: END WRITE HIDE/SHOW COOKIE :::

//			::: START READ HIDE/SHOW COOKIE :::

function readPrefs() {
	// grab all h2 elements
	var h = document.getElementById('content').getElementsByTagName('h2');
	
	// check cookie for hide/show preferences
	for(i=0; i<h.length; i++){
		// gets the element after the h2 heading
		var ul = h[i].nextSibling;
		h[i].id = 'h2' + i;
			
		// makes sure ul is an element, not a blank space or carriage return
		while (ul.nodeType != 1){
			ul = ul.nextSibling;
		}
		
		var cookieName = 'h2' + i;
		
		if (document.cookie.length > 0) { 		
			var begin = document.cookie.indexOf(cookieName+"="); 
			if (begin != -1) { 			
				begin += cookieName.length+1; 
				var end = document.cookie.indexOf(";", begin);
				
				if (end == -1) end = document.cookie.length;
				
				// gets display status from cookie
				var secValue = unescape(document.cookie.substring(begin, end));
				
				// sets dispaly status to equal that which was in the cookie
				var secStatus = (secValue == 'none') ? 'none' : 'block';
				var h2Img = (secValue == 'none') ? 'maximise' : 'minimise';
				
				document.getElementById(cookieName).className = h2Img;
				ul.style.display = secStatus;
			} 
		}
	}
}

//			::: END READ HIDE/SHOW COOKIE :::