/*
	Script by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/	
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};
/* end Script by Robert Nyman */

// ----------------------------------------------------------------------------
// HasClassName
//
// Description : returns boolean indicating whether the object has the class name
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to add
//
function hasClassName(objElement, strClass)
   {

   // if there is a class
   if ( objElement.className )
      {

      // the classes are just a space separated list, so first get the list
      var arrList = objElement.className.split(' ');

      // get uppercase class for comparison purposes
      var strClassUpper = strClass.toUpperCase();

      // find all instances and remove them
      for ( var i = 0; i < arrList.length; i++ )
         {

         // if class found
         if ( arrList[i].toUpperCase() == strClassUpper )
            {

            // we found it
            return true;

            }

         }

      }

   // if we got here then the class name is not there
   return false;

   }
// 
// hasClassName
// ----------------------------------------------------------------------------

function getNextSibling(node){
    x = node.nextSibling;
    while (x.nodeType!=1) {
      x = x.nextSibling;
      }
    return x;
} //funtion getNextSibling

function init(){
	var bodyElement = document.body;
    // collect all articles
 	var articleElements = getElementsByClassName('article');  
    // hide all articles except first
	for(i=1;i<articleElements.length;i++) articleElements[i].style.display='none';
  	//setup secondary navigation behavior
	if(document.getElementById('navSec')){
		var navSecLinks = document.getElementById('navSec').getElementsByTagName('a');
		for(i=0;i<navSecLinks.length;i++) {
			navSecLinks[i].onclick=function(){
				  // hide previous article
				for(j=0;j<articleElements.length;j++) articleElements[j].style.display='none';
				  // show article with this hash
				document.getElementById(this.hash.slice(1)).style.display='block';
				  // remove previous hilight
				for(j=0;j<navSecLinks.length;j++) navSecLinks[j].className='';
				  // hilight this link
				this.className='selected';
				  // change next sibling border color
				if(this.parentNode.className != 'last') getNextSibling(this.parentNode).firstChild.className='nextSibling';
				return false;
			}//end function
/*
			navSecLinks[i].onclick=function(){
				return false;
			}//end function
*/
		} //end for
	}//end if

}//end function

window.onload=function(){
	init();
}//end function


function cleanup(){
	if (document.images && document.getElementById('navPri')) {
		var navPriImages = document.getElementById('navPri').getElementsByTagName('img');
		for(i=0;i<navPriImages.length;i++) {
			navPriImages[i].src = "_img/_navigation/"+navPriImages[i].id+".gif";
		} //end for
	} // end if
}//end function

window.onunload=function(){
	cleanup();
}//end function