/*
PureDOM explorer 3.1
written by Christian Heilmann (http://icant.co.uk)
Please refer to the pde homepage for updates: http://www.onlinetools.org/tools/puredom/
Free for non-commercial use. Changes welcome, but no distribution without
the consent of the author.
*/
PreImage1= new Image();
PreImage1.src = "images/minus.jpg";
PreImage2 = new Image();
PreImage2.src = "images/plus.jpg";
pde={
   // CSS classes
   pdeClass:'pde',
   hideClass:'hide',
   showClass:'show',
   parentClass:'parent',
   currentClass:'current',
   // images added to the parent links
   openImage:'images/minus.jpg',
   closedImage:'images/plus.jpg',
   openMessage:'close section',
   closedMessage:'open section',
  // boolean to keep the section with the STRONG open or not.
  keepCurrentOpen:true,
   // boolean to make the parent link collapse the section or not 
   linkParent:false,
   init:function(){
      pde.createClone();
      if(!document.getElementById || !document.createTextNode){return;}
      var uls=document.getElementsByTagName('ul');
      for(var i=0;i<uls.length;i++){
      var inneruls,parentLI;
         if(!pde.cssjs('check',uls[i],pde.pdeClass)){continue;}
         var inneruls=uls[i].getElementsByTagName('ul');
         for(var j=0;j<inneruls.length;j++){
            parentLI=inneruls[j].parentNode;
            if(parentLI.getElementsByTagName('strong')[0]){
               pde.cssjs('add',parentLI,pde.currentClass);
               if(pde.keepCurrentOpen === true){continue;}
            }
            pde.cssjs('add',parentLI,pde.parentClass);
            parentLI.insertBefore(pde.clone.cloneNode(true),parentLI.firstChild);
            pde.cssjs('add',inneruls[j],pde.hideClass);
            pde.addEvent(parentLI.getElementsByTagName('a')[0],'click',pde.showhide,false);
            parentLI.getElementsByTagName('a')[0].onclick=function(){return false;} // Safari hack
            if(pde.linkParent){
               pde.addEvent(parentLI.getElementsByTagName('a')[1],'click',pde.showhide,false);
               parentLI.getElementsByTagName('a')[1].onclick=function(){return false;} // Safari hack
            }
         }
      }
   },
   showhide:function(e){
      var image,message;
      var elm=pde.getTarget(e);
      var ul=elm.parentNode.getElementsByTagName('ul')[0];
      var img=elm.parentNode.getElementsByTagName('img')[0];
      if(pde.cssjs('check',ul,pde.hideClass)){
         message=pde.openMessage;
         image=pde.openImage;
         pde.cssjs('remove',elm.parentNode.getElementsByTagName('ul')[0],pde.hideClass);
         pde.cssjs('add',elm.parentNode.getElementsByTagName('ul')[0],pde.showClass);
      } else {
         message=pde.closedMessage;
         image=pde.closedImage;
         pde.cssjs('remove',elm.parentNode.getElementsByTagName('ul')[0],pde.showClass);
         pde.cssjs('add',elm.parentNode.getElementsByTagName('ul')[0],pde.hideClass);
      }
      img.setAttribute('src',image);
      img.setAttribute('alt',message);
      img.setAttribute('title',message);
      pde.cancelClick(e);
   },
   createClone:function(){
      pde.clone=document.createElement('a');
      pde.clone.setAttribute('href','#');
      pde.clone.appendChild(document.createElement('img'));
      pde.clone.getElementsByTagName('img')[0].src=pde.closedImage;
      pde.clone.getElementsByTagName('img')[0].alt=pde.closedMessage;
      pde.clone.getElementsByTagName('img')[0].title=pde.closedMessage;
   },
/* helper methods */
   getTarget:function(e){
      var target = window.event ? window.event.srcElement : e ? e.target : null;
      if (!target){return false;}
      if (target.nodeName.toLowerCase() != 'a'){target = target.parentNode;}
      return target;
   },
   cancelClick:function(e){
      if (window.event){
         window.event.cancelBubble = true;
         window.event.returnValue = false;
         return;
      }
      if (e){
         e.stopPropagation();
         e.preventDefault();
      }
   },
   addEvent: function(elm, evType, fn, useCapture){
      if (elm.addEventListener) 
      {
         elm.addEventListener(evType, fn, useCapture);
         return true;
      } else if (elm.attachEvent) {
         var r = elm.attachEvent('on' + evType, fn);
         return r;
      } else {
         elm['on' + evType] = fn;
      }
   },
   cssjs:function(a,o,c1,c2){
      switch (a){
         case 'swap':
            o.className=!pde.cssjs('check',o,c1)?o.className.replace(c2,c1):o.className.replace(c1,c2);
         break;
         case 'add':
            if(!pde.cssjs('check',o,c1)){o.className+=o.className?' '+c1:c1;}
         break;
         case 'remove':
            var rep=o.className.match(' '+c1)?' '+c1:c1;
            o.className=o.className.replace(rep,'');
         break;
         case 'check':
            return new RegExp("(^|\s)" + c1 + "(\s|$)").test(o.className)
         break;
      }
   }
}
pde.addEvent(window, 'load', pde.init, false);