Problem trying to get character to look at mouse?

Hi guys im currently trying to make a 2D shooter similar to something like Intrusion 2, currently at the stage where i have a character and am trying to make it so he always aims at the mouses location. It works perfectly if the character faces right, but if i turn him around the arm faces is the exact opposite direction of the mouse.


The problem is in axis. Move everything in one quarter, so that your mouse doesn’t move over X or Y Axis.