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


function removeClass(element, classToRemove) {
	if( element.className != classToRemove ) {
		var elementClassStr = new String(element.className);
		var elementClassArr = elementClassStr.split(" ");
		var newClassStr = "";
		for( var idx = 0; idx < elementClassArr.length; idx++ ) {
			if( classToRemove != elementClassArr[idx] ) {
				newClassStr += elementClassArr[idx] + " ";
			}
		}
		element.className = newClassStr;
	}
	else {
		element.className = "";
	}
}