function getElementsByClassName(className, tag, elm){
	var testClass = new RegExp("(^|\s)" + className + "(\s|$)");
	var tag = tag || "*";
	var elm = elm || document;
	var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
		current = elements[i];
		if(testClass.test(current.className)){
			returnElements.push(current);
		}
	}
	return returnElements;
}

function Category(target,mode) {
	if (mode=="in") getElementsByClassName("Summary","div",target)[0].style.visibility="hidden";
	else getElementsByClassName("Summary","div",target)[0].style.visibility="visible";
}