Need help Loading images with selection on a form field?

So I'm kind of a newb.. I can do basic forms but I need to set up a form field drop down box that will give me the ability to load images correlating to the users choice. I'm at a total loss for where to start, so ANY help would be appreciated. If you know of any good books or tutorials on the subject please share.
Thanks in advance
Sincerely,
Stumped4now 

P.S. I think I'm getting a better understanding of OCGs after lots of research today. However I still seem to be missing something
var docOCGs = this.getOCGs();
for (var x=0; x < docOCGs.length; x++)
  if(docOCGs[x].name == "Layer1")
  docOCGs[x].state = !docOCGs[x].state;

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