function addClass(element, value) {
	if(!element.className) {
		element.className = value;
      } else {
		newClassName = element.className;
		newClassName+= " ";
		newClassName+= value;
		element.className = newClassName;
      }
}

function changeClass (elementID, newClass) {
	var element = document.getElementById(elementID);
	
	element.setAttribute("class", newClass); //For Most Browsers
	element.setAttribute("className", newClass); //For IE; harmless to other browsers.
}