What you do with .jpg is the same as you do with .bmp. But you have to type in the address to the picture instead of clicking it. Do you know how to ad it then?
You need BigGUI and FshX first of all, just to handle the files. Then go to your \NBA LIVE 2005\sgsm\common\xshoes.viv and open it with BigGUI. Extract the right file that you wan't to replace (Here's a list) and open the file with FshX. In there you choose import (before that you might wan't to take Double Texture for better detail) and select the shoe (-picture) that you'd like to add. Then just save the file and put it in either your main 'NBA Live 2005'-folder or in the 'SGSM'-folder. That's pretty much the easy way. Let me know if you get any problem with it...
A pink shoe is a problem with the shoe-file. Perhaps you put in an corrupt file that is the shoe that the players are wearing.
Look up what shoe it is that those players are wearing and then look up the shoes .fsh file and see if there's anything wrong with that.