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|$)");
	var j = 0;
	for (var i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i]; j++;
		}
	}
	return classElements;
}

function hideSpoilers() {
	var spoilers = getElementsByClass('spoiler');
	for(x in spoilers) {
		spoilers[x].getElementsByTagName('span')[0].style.display = 'none';
	}
};

function spoiler(obj) {
	var st = obj.getElementsByTagName('span')[0].style;
	st.display = (st.display == 'none' || st.display == '') ? 'block' : 'none';
}