function toggleCssProps(manager, add) {
	    var element = manager.element;
	    if (!element.style) {
	        return;
	    }
	    var prop;
	    each(manager.options.cssProps, function(value, name) {
	        prop = prefixed(element.style, name);
	        if (add) {
	            manager.oldCssProps[prop] = element.style[prop];
	            element.style[prop] = value;
	        } else {
	            element.style[prop] = manager.oldCssProps[prop] || '';
	        }
	    });
	    if (!add) {
	        manager.oldCssProps = {};
	    }
	}
add/remove the css properties as defined in manager.options.cssProps
@param {Manager} manager
@param {Boolean} add