// JavaScript Document

function hasClass(target, classValue) {

	var pattern = new RegExp("(^| )" + classValue + "( |$)");
	
	if (target.className.match(pattern)) {
		return true;
	}
	
	return false;
}

function addClass(target, classValue) {

	if (!hasClass(target, classValue)) {
		
		if (target.className == "") {
			target.className = classValue;
		} else {
			target.className += " " + classValue;
		}
	}
	return true;
}

function removeClass(target, classValue) {

	var removedClass = target.className;
	var pattern = new RegExp("(^| )" + classValue + "( |$)");
	removedClass = removedClass.replace(pattern, "$1");
	removedClass = removedClass.replace(/ $/, "");
	target.className = removedClass;
	return true;
}

document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	}
	return retnode;
}