Magento Javascript debugging and CSS

I have created a website based on ecommerce platform Magento. I have heavily modified a custom template, adhering to Magento theme design standards such as no modifications to base templates etc. I also have a mobile theme installed which needs some modification. Everything is working well with the exception of a few small javascript issues on some pages. I am looking for a person who is skilled in javascript and experienced in Magento to debug the couple of script issues. Some skills in CSS would be preferable. I am looking for quality, well coded solutions to the issues and not 'hack' fixes. Magento is a complex platform and experience with Magento is an absolute must. I envisage that there would only be a couple of hours work in this project for an experienced developer.