Markup language: 
Txt2tags

Description:
A basic Txt2tags markup set with Headings, Bold, Italic, Underline, Strike, Picture, Link, Lists, Quote, Code, Raw, Preview button.

Install:
- Download the zip file
- Unzip it in your markItUp! sets folder
- Modify your JS link to point at this set.js
- Modify your CSS link to point at this style.css