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/main/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         
                    if (imgStatus = (ulStatus == 'block')) {
                        this.src = '/images/main/minimise.gif';
                    } else {
                        this.src = '/images/main/maximise.gif';
                    }           
                }
            }
        }
        
    }
    // JAU Headings don't need to collapse anymore
    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';
                //JAU Make all H2 headings expand fully
                h2Img = 'maximise';
                secStatus = 'block';
                document.getElementById(cookieName).className = h2Img;
                ul.style.display = secStatus;
            } 
        }
    }
}
//            ::: END READ HIDE/SHOW COOKIE :::