gistfile1.js

unselectable: {
		set: function(value) {
			Browser.Engine.gecko && (this.style.MozUserSelect = value ? 'none' : 'text') ||
                Browser.Engine.webkit && (this.style.KhtmlUserSelect = value ? 'none' : 'text') ||
                (Browser.Engine.trident || Browser.Engine.opera) && (this.unselectable = value ? 'on' : 'off');
			this.getChildren('*').set('unselectable', value);
			return this;
		}
	},