Hi there, I'm Matt Sergei (do call me Matt) and would like to help you (25 years a webmaster and IT developer).
I understand what you mean yet I'm the SVG pro - if you have your map in vector format (SVG or not) I will convert it into SVG and add your layers. With a possibility to turn red and blue layers on and off with simple checkbox button overlaid on the map.
While I'm not a graphic designer per se I can manipulate any multimedia, including more or less automatic vectorization of bitmap image formats (e.g. PNG, BMP, TIFF, JPEG) if they are not too complex (like multigradients etc, not supported in SVG).
Looking forward to your reply,
Matt