function toggleYear(yr) {
	hideYears();
	var selectedPointer = document.getElementById("pointer" + yr);
	selectedPointer.style.visibility = "visible";
	var selectedDocs = document.getElementById("doc" + yr);
	selectedDocs.style.display = "block";
}

function hideYears(){
	var years = getElementsByClass("infoPointer");
	for (var year in years) {
		years[year].style.visibility = "hidden";
	}
	years = getElementsByClass("infoDoc");
	for (var year in years) {
		years[year].style.display = "none";
	}
}

function getElementsByClass(searchClass, node, tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}