// credit to -> http://www.uleth.ca/man/help/sitemap.shtml

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 h4 elements
   var h = document.getElementsByTagName('h4');
   // grab all unordered lists
   var u = document.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
            var img = document.createElement('img');
               img.className = 'icon';            
               img.src = '/man/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 = '/man/images/' + imgStatus + '.gif';
            }
         }
      }
      
   }
   
   for(x=0;x<h.length;x++){
      // assign unique IDS to each h4 element
      h[x].id = 'h4' + x;
      h[x].className = 'maximise';
      
      // make h4 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 h4 elements
   var h = document.getElementsByTagName('h4');
   
   // check cookie for hide/show preferences
   for(i=0; i<h.length; i++){
      // gets the element after the h4 heading
      var ul = h[i].nextSibling;
      h[i].id = 'h4' + i;
         
      // makes sure ul is an element, not a blank space or carriage return
      while (ul.nodeType != 1){
         ul = ul.nextSibling;
      }
      
      var cookieName = 'h4' + 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 h4Img = (secValue == 'none') ? 'maximise' : 'minimise';
            
            document.getElementById(cookieName).className = h4Img;
            ul.style.display = secStatus;
         } 
      }
   }
}

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