need to change t-shirt colors in photoshop

Hello, I need to change colors of a set of 45 t-shirts. They are currently in green, blue and pink colors but I want them in white. an example of this work is available on following link (the orignal color was red but they changed it into all the other colors). [login to view URL] The t-shirt texture must not be lost. I am attaching only one picture right now, If you want the project, please show me if you can do the job.