function r(imageToChange,dirLevel,state) {

  locationOfImageDir = imageToChange.src.indexOf("/i/"+1);
      
  if (dirLevel == 1) {
    activeDir = "i/";
  } else if (dirLevel == 2) {
    activeDir = "../i/";
  }
    
  if (state == true){    
    imageName = imageToChange.src.substring(locationOfImageDir,(imageToChange.src.search("jpg")-4))+".jpg";                   
    imageToChange.src = imageName;
    
  } else {    
    imageName = imageToChange.src.substring(locationOfImageDir,(imageToChange.src.search("jpg")-1))+"_bw.jpg";               
    imageToChange.src = imageName;   
    
  }
  
}