Digital Watermarking In Spatial Domain

I want make digital image watermarking in spatial domain with Iterative Watermark Embedding method that embed watermark in 4 different position, top, bottom, right+left and center. The original watermark is permuted by chaotic binary sequence and Gray Code. This watermark must robust against several attack, such as cropping, rotate, scaling, JPEG compresion, etc. I use matlab 7 to make this implementation. I had make GUI for this program. If you know how to make this program, please bid this job. I will send you the paper n journal about this method, also the m and fig files that i have. I will pay you if only I satisfied with your work.