just copy the dortmundstadium files in 0_text using afsexplorer, all of them and I renamed them instead of stw20...... stj07...(i.e. stw20df_au_aw0.bin becomes--> stj07df_au_aw0.bin do this with every file starting with stw20), I replaced the yokohama international stadium with the philips stadium, but i guess you coul do any other stadium slot aswell... after having renamed them just put them in a folder(i believe in total they are 44 files) and in afs explorer just right click on the first original stj07 scroll down to import files or folders by name, then look for the folder in which you saved the extracted and namechanged .bin files, highlight them all and press open now a screen will ask you something and you must select yes to all now it will import the dortmund stadium over the original yokohama stadium and you will now have 2 dortmundstadiums... So now click on the stj07df_base.bin and there will be some pictures displayed on the bottom, these can be changed to make your stadium look like the philips stadium, do the same for stj07dr_base.bin, stj07nf_base.bin & stj07nr_base.bin.
the things i changed to make the stadium look like the philips stadium are the stands, the benches, the advertisements, the screens displayed on the instadiummonitor and corner flag, you can change many things that i didn't though such as the pitch texture, the net color of the goals etc etc. I will attch the bmp files i altered with fireworks which you can click on the stj07df_base.bin file in afsexplorer and then open the bmp file now just drag the picture over to the slot in which it belongs and your set, do this for all 4 stj07 base files(each represents either day night rain good weather)
note that you can change all types of things in the base files(if you don't like my alterations do them yourself<g>), just edit them in photoshop or fireworks and export preview then select bmp 8 and the allowed colors and click export then open the afsexplorer and the 0_text and find the base file and open the just created image now select the black button on the right meaning 100% opacity and drag and drop the file in slot of your liking.
hope this helps with your stadium editing
btw, i am not allowed to attach bmp files so i'll attach them as png files, just open and export preview and select 8 bmp now insert...