Cross Browser JavaScript Project

We are looking for JavaScript Experts...MUST have deep understanding of JavaScript OOP and be familiar with cross-browser scripting. A sample project can be found [login to view URL] which is a basic version of what we are trying to achieve.... Draggable Windows....with lots of functionalities such as minimize and maximize all using JavaScript and cross browser capabilities. Please only bid if you have done something similar and you are certain you can complete this project.