function getElementsByClassName(oElm, strTagName, strClassName){
	var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
	var arrReturnElements = new Array();
	strClassName = strClassName.replace(/\-/g, "\\-");
	var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
	var oElement;
	for (var i = 0; i < arrElements.length; i++){
		oElement = arrElements[i];
		if (oRegExp.test(oElement.className)) {
			arrReturnElements.push(oElement);
		}
	}
	return (arrReturnElements)
}

function setActive(element,baseClassName,activeClassName) {
    var elementParent = element.parentNode;
    var elementList = getElementsByClassName(elementParent, "div", "expandable");
    for (var i = 0, len=elementList.length; i<len; ++i ) {
        elementList[i].className = baseClassName;
    }
    element.className = activeClassName;
}