Hi there,
Please follow this link http://jsfiddle.net/HQS8s/ and add JS under Customize -> Custom -> Global JavaScript.
Add HTML part in raw content element.
Further customizations from here would be getting into custom development, which is outside the scope of support we can offer. If you need more in depth changes, you may wish to consult with a developer. X is quite extensible with child themes, so there are plenty of possibilities. Thanks for understanding.