Cannot open picture files after burning

Hi everyone,
I have just burned my picture files into CD using Nero. Maybe I made a big mistake when burning, I chose data dics type for the picture files and now I cannot open any picture files from this disk. All files were damaged. I burned two CD like this but both of them were error. I tried to open but there is no way. Some one can help me recover this data. These pictures are very important with me. Thanks