Make some simple graphic design changes to a Facebook App

I have had a Facebook App designed/built by a company but I need to find someone else to make some graphic design improvements to it, as the previous company did not finish it properly. This is a fairly simple job for someone who has experience designing Facebook Apps (cake php cms).

My guess is that there is approximately 2-3 hours work to be done on this, but I appreciate that it requires a specialist skill set, so am prepared to pay up to £300 for the right coder to complete it within the next 7 days.

We can only consider applications from people whose profile demonstrates that they have plenty of experience designing Facebook Apps.