How do you change the orientation of your characters in RPG Maker VX?

I downloaded several custom sprites from a few places and some of them were posted in such a manner that when it should be facing forward, the character is instead facing backward, and when they should be facing left, they are facing forward, etc. Short of re-editing all of the custom sprites via Photoshop or what have you, is there any way to change the orientation of the characters to the correct facing? I apologize for such a question, but I've looked on several of the forums for the program as well as the "help" function and a few guides and can't seem to find any answers. I'm rather new at the program.