Hello all, first post here

I am using X-cart 4.2 and wanted to change the default "Buy Now" button to one of my own.
I looked and thought this just involved replacing "but_main_left.png" with my own graphic. To my suprise after the switch, I get a sort of hybrid mix between the x-cart and my custom image. Then I noticed there was also a "but_main_right.png" file that seems to be a small part of the total image.
I do not understand why the button is build from 2 different files instead of 1. More so even if i totally delete "but_main_right.png" from the template, it still seems to get graphics from the old button mixed with my own button.
If there is, where is the place I can just "select" my button to use in a graphical interface (backend) somewhere ?
If there is not, shouldn't there be a just simple one step "change Buy Now Button" option that involves just me selecting a image and x-cart changing it automatically ?
Thanks for the help.