How to install a Raised Garden Bed

First step is to decide how large an area we need for the garden frame and what preparations are necessary to make the spot ready such as removal of existing grass or weeds . . . http://www.raised-garden-bed.com/install.html
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If I want to install a raised garden bed for vegetables and some flowers on top of an asphalt patio, what do I need to do to that asphalt layer, presumably to contain the dirt? Would it be enough to lay some landscape fabric and staple it to the edges of the garden frame?
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Thanks for your question. I am just starting my second season planting a garden located on a cement driveway. This particular on is constructed using cedar decking material. The top frame is joined to the bottom frame with three dowels in a triangulation. The corners are re-enforced with metal angles. Coated decking screws bisect the mitered corners so that they enter the wood going across the grain. This is done to avoid inserting the screws into the ends of the boards as they would easily pull out. Once the frame is placed on the hard surface, whether it be a cement driveway or asphalt patio or even an apartment or condo roof top, it is filled with bags of topsoil which is purchased at the local garden center. This particular garden measures 4 ft. by 4 ft. and is about eleven inches tall. This size requires half a cubic yard of soil which translates into 14 forty pound bags. Cost per bag is currently anywhere from 85 cents to $1.25 each depending where it is purchased. I did not experience any leakage out the bottom of the garden so the soil went directly onto the concrete surface. Only risk I can see is that it may stain the surface beneath the soil.
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