function showSection(section) {

	if(typeof(openSection) == "undefined"){ openSection = ''; }
	

	//Close section if clicking on an open heading
	if(section == openSection){	
		var openElements = getElementsByClass(document,section,'*');
		var totalElements = openElements.length;		
		for(i=0; i < totalElements; i++){
			openElements[i].style.display = 'none'; 
			openSection = '';
		} 
		return;
	}
	
	//Close any open sections
	if(openSection != ''){
		var visibleSection = getElementsByClass(document,openSection,'*');
		var visibleElements = visibleSection.length;
		for(i=0; i < visibleElements; i++){
			visibleSection[i].style.display = 'none'; 
		}		
		openSection = '';
	}
	
	//Open selected section
	if(openSection == '' && openSection != section){	
		var openElements = getElementsByClass(document,section,'*');
		var totalElements = openElements.length;		
		for(i=0; i < totalElements; i++){
			openElements[i].style.display = 'block'; 
			openSection = section;
		} 
	}
}

//Hide all of the course entries
function hideAll(){
	//Get all elements on the page using the name of the class
	var allEl = getElementsByClass(document,"course",'*');
	//Get the total number of class elements
	var totalAllElements = allEl.length;
	//Loop through all open elements and hide them
	for(j=0; j < totalAllElements; j++){
		allEl[j].style.display = 'none'; 
	}	
}

function getElementsByClass(node,searchClass,tag) {
	var classElements = new Array();
	var els = node.getElementsByTagName(tag); // use "*" for all elements
	var elsLen = els.length;
	var pattern = new RegExp("\\b"+searchClass+"\\b");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
 			classElements[j] = els[i];
			 j++;
		}
	}
	return classElements;
}