diff --git a/backend/config/Config.ts b/backend/config/Config.ts
new file mode 100644
index 00000000..e97050c4
--- /dev/null
+++ b/backend/config/Config.ts
@@ -0,0 +1,6 @@
+
+export class Config{
+    public static thumbnailSizes = [200];
+    public static imagesFolder = "/demo/images";
+    public static thumbnailFolder = "/demo/TEMP";
+}
\ No newline at end of file
diff --git a/backend/middlewares/GalleryMWs.ts b/backend/middlewares/GalleryMWs.ts
index 604cd48c..4ab5dee1 100644
--- a/backend/middlewares/GalleryMWs.ts
+++ b/backend/middlewares/GalleryMWs.ts
@@ -4,14 +4,19 @@ import * as fs from 'fs';
 import {NextFunction, Request, Response} from "express";
 import {Error, ErrorCodes} from "../../common/entities/Error";
 import {GalleryManager} from "../model/GalleryManager";
-import {Directory} from "../../common/entities/Directory"; 
+import {Directory} from "../../common/entities/Directory";
+import {Config} from "../config/Config";
 
 export class GalleryMWs {
 
 
+    private static getImageFolder(){
+        return path.join(__dirname,"/../../",Config.imagesFolder);
+    }
+
     public static listDirectory(req:Request, res:Response, next:NextFunction){
         let directoryName = req.params.directory || "/";
-        let absoluteDirectoryName = path.join(__dirname,"/../../demo/images", directoryName);
+        let absoluteDirectoryName = path.join(GalleryMWs.getImageFolder(), directoryName);
         
         if(!fs.statSync(absoluteDirectoryName).isDirectory()){
             return next();
@@ -32,7 +37,7 @@ export class GalleryMWs {
             return next();
         }
 
-        let fullImagePath =  path.join(__dirname,"/../../demo/images", req.params.imagePath);
+        let fullImagePath =  path.join(GalleryMWs.getImageFolder(), req.params.imagePath);
         if(fs.statSync(fullImagePath).isDirectory()){
             return next();
         }
diff --git a/backend/middlewares/ThumbnailGeneratorMWs.ts b/backend/middlewares/ThumbnailGeneratorMWs.ts
index 71593ecb..b137b4b8 100644
--- a/backend/middlewares/ThumbnailGeneratorMWs.ts
+++ b/backend/middlewares/ThumbnailGeneratorMWs.ts
@@ -7,29 +7,39 @@ import * as crypto from 'crypto';
 import * as fs from 'fs';
 import {NextFunction, Request, Response} from "express";
 import {Error, ErrorCodes} from "../../common/entities/Error";
+import {Config} from "../config/Config"; 
 
 
 
 export class ThumbnailGeneratorMWs {
 
+    private static getThumbnailFolder(){
+        return path.join(__dirname,"/../../",Config.thumbnailFolder);
+    }
+    
     public static generateThumbnail(req:Request, res:Response, next:NextFunction){ 
         if(!req.resultPipe)
             return next();
 
         let imagePath = req.resultPipe;
-        let size:number = parseInt(req.params.size) || 200; //TODO:put to config
+        let size:number = parseInt(req.params.size) || Config.thumbnailSizes[0]; 
+        let thumbnailFolder = ThumbnailGeneratorMWs.getThumbnailFolder();
 
+        if(Config.thumbnailSizes.indexOf(size) === -1){
+            size = Config.thumbnailSizes[0];
+        }
 
-        let thPath = path.join(__dirname,"/../../demo/TEMP",ThumbnailGeneratorMWs.generateThumbnailName(imagePath,size));
+        let thPath = path.join(thumbnailFolder,ThumbnailGeneratorMWs.generateThumbnailName(imagePath,size));
+
+        
         req.resultPipe = thPath;
 
         if(fs.existsSync(thPath) === true){ 
             return next();
         }
-
-        let tmpDir = path.join(__dirname,"/../../demo/TEMP");
-        if (!fs.existsSync(tmpDir)){
-            fs.mkdirSync(tmpDir);
+ 
+        if (!fs.existsSync(thumbnailFolder)){
+            fs.mkdirSync(thumbnailFolder);
         }
 
         Jimp.read(imagePath).then( (image) => {