Need help for photoshop actions

[TheEye]

I am trying to batch convert jpg to png and do some minor modification to the image before saving as png and i can do that but when it saves the png it renames the jpg to 0.png how can i change that please help !!!

[TheEye]

now one knows or dos not understand the question ???
i made a simple action that apply's Posterize 40, merge layers and save as png put it changes the original name of the file to 0 how can i change that.