Joomla Booking Component

I need a person who can made some PHP routine changes in an existing booking component for joomla 2.5 system. The component is appointment booking pro, the candidate must be able to extend the backend for mutiple booking and also the frontend view for this changes. Requirements: - Knowledge of Joomla 2.5 - Knowledge of Booking Component - Exakt working - It's not allowed publishing this work in private portfolio or elsewhere - All changed items must be commented, original items backuped - Payment 50/50 over freelancer.com For further Information pls. contact me i'll send some descriptions and screenings. This job is very urgent, pls bid only if you have time to handle this job within 3 days.