On Stack Overflow, there are quite a few questions, such as http://stackoverflow.com/questions/7658399/adding-checked-products-to-a-custom-php-basket, where the OP wants you to implement things for him, without really asking a question.
So, when you face this problem, there are 2 solutions:
Do the work yourself, and add a specific question if you happen to have one, like Pekka suggested:
I suggest you try for yourself [implement the feature / fix the problem] and come back if you have specific, answerable questions
Go to a website designed for this purpose.
Do you know if such a website exists?