diff --git a/pechakucha10x20/U_CheckFolder.pde b/pechakucha10x20/U_CheckFolder.pde
new file mode 100644
index 0000000..8ad2aa1
--- /dev/null
+++ b/pechakucha10x20/U_CheckFolder.pde
@@ -0,0 +1,113 @@
+ArrayList imageFiles = new ArrayList();
+boolean folderIsSelected ;
+int countSelection ;
+String selectedPathFolder = ("") ;
+// main void
+//choice Folder
+void choiceFolder() {
+  folderIsSelected = true ;
+  if(key =='o') selectFolder("Select a folder to process:", "folderSelected");
+}
+
+
+
+// check what's happen in the selected folder
+void checkFolder() {
+  if(folderIsSelected && selectedPathFolder != ("") ) {
+    countSelection++ ;
+    imageFiles.clear() ;
+    String path = selectedPathFolder ;
+  
+    println("Listing info about all files in a directory and all subdirectories: ");
+    ArrayList allFiles = listFilesRecursive(path);
+  
+    String fileName = "";
+  
+    for (int i = 0; i < allFiles.size(); i++) {
+      File f = (File) allFiles.get(i);   
+      fileName = f.getName(); 
+      //println("Name: " + filename);
+      //println("Full path: " + f.getAbsolutePath());
+      //println("Is directory: " + f.isDirectory());
+  
+      // Add it to the list if it's not a directory
+      if (f.isDirectory() == false) {
+        String lastThree = fileName.substring(fileName.length()-3, fileName.length());
+        if (lastThree.equals("PNG") || lastThree.equals("png") || lastThree.equals("JPG") || lastThree.equals("jpg") || lastThree.equals("GIF") || lastThree.equals("gif")) {
+          imageFiles.add(f);
+        }
+      }
+    }
+    // show the info name file
+    for (int i = 0; i < imageFiles.size(); i++) {
+      File f = (File) imageFiles.get(i); 
+      println("Name: " + f.getName());
+    }
+    
+    // to don't loop with this void
+    folderIsSelected = false ;
+  }
+}
+// end main void
+
+//choice Folder
+void folderSelected(File selection) {
+  if (selection == null) {
+    println("Window was closed or the user hit cancel.");
+  } else {
+    println("User selected " + selection.getAbsolutePath());
+    selectedPathFolder = selection.getAbsolutePath() ;
+    folderIsSelected = true ;
+  }
+}
+
+// This function returns all the files in a directory as an array of Strings  
+String[] listFileNames(String dir) {
+  File file = new File(dir);
+  if (file.isDirectory()) {
+    String names[] = file.list();
+    return names;
+  } 
+  else {
+    // If it's not a directory
+    return null;
+  }
+}
+
+// This function returns all the files in a directory as an array of File objects
+// This is useful if you want more info about the file
+File[] listFiles(String dir) {
+  File file = new File(dir);
+  if (file.isDirectory()) {
+    File[] files = file.listFiles();
+    return files;
+  } 
+  else {
+    // If it's not a directory
+    return null;
+  }
+}
+
+// Function to get a list ofall files in a directory and all subdirectories
+ArrayList listFilesRecursive(String dir) {
+  ArrayList fileList = new ArrayList(); 
+  recurseDir(fileList, dir);
+  return fileList;
+}
+
+// Recursive function to traverse subdirectories
+void recurseDir(ArrayList a, String dir) {
+  File file = new File(dir);
+  if (file.isDirectory()) {
+    // If you want to include directories in the list
+    a.add(file);  
+    File[] subfiles = file.listFiles();
+    for (int i = 0; i < subfiles.length; i++) {
+      // Call this function on all files in this directory
+      recurseDir(a, subfiles[i].getAbsolutePath());
+    }
+  } 
+  else {
+    a.add(file);
+  }
+}
diff --git a/pechakucha10x20/pechakucha10x20.pde b/pechakucha10x20/pechakucha10x20.pde
index 7a60f8e..c23466d 100644
--- a/pechakucha10x20/pechakucha10x20.pde
+++ b/pechakucha10x20/pechakucha10x20.pde
@@ -1,75 +1,33 @@
-
-import java.io.File;
-
-boolean start = true;
-
-int lastSecond;
-int thisImage = 0;
-
-ArrayList imageFiles = new ArrayList();
-
+// main source is from UCLA Arts Software Studio by Casey Reas
 void setup() {
   size(1024, 768); 
+  lastSecond = second();
+  instruction() ;
+}
 
-  String path = sketchPath;
-
-  println("\nListing info about all files in a directory and all subdirectories: ");
-  ArrayList allFiles = listFilesRecursive(path);
-
-  String fileName = "";
-
-  for (int i = 0; i < allFiles.size(); i++) {
-    File f = (File) allFiles.get(i);   
-    fileName = f.getName(); 
-    //println("Name: " + filename);
-    //println("Full path: " + f.getAbsolutePath());
-    //println("Is directory: " + f.isDirectory());
+PImage img;
 
-    // Add it to the list if it's not a directory
-    if (f.isDirectory() == false) {
-      String lastThree = fileName.substring(fileName.length()-3, fileName.length());
-      if (lastThree.equals("PNG") ||
-        lastThree.equals("png") ||
-        lastThree.equals("JPG") ||
-        lastThree.equals("jpg") ||
-        lastThree.equals("GIF") ||
-        lastThree.equals("gif")) {
+void draw() {
+  checkFolder() ;
+  showPictures() ;
+}
+void keyPressed() {
+  choiceFolder() ;
+}
 
-        imageFiles.add(f);
-      }
-      println(lastThree);
-    }
-    //println("Size: " + f.length());
-    //String lastModified = new Date(f.lastModified()).toString();
-    //println("Last Modified: " + lastModified);
-    println("-----------------------");
-  }
 
-  println("-----------------------");
-  println("-----------------------");
-  println("-----------------------");
-  println("-----------------------");
-  println("-----------------------");
 
-  for (int i = 0; i < imageFiles.size(); i++) {
-    File f = (File) imageFiles.get(i); 
-    println("Name: " + f.getName());
-  }
+// ANNEXE
 
-  lastSecond = second();
-  
-  //line(0, 0, width, height);
-  //line(0, height, width, 0);
-  textAlign(CENTER);
-  background(255);
-  text("PRESS SPACEBAR TO START", width/2, height/2);
-}
 
-PImage img;
+int lastSecond;
+int thisImage = 0;
+int countRef ;
 
-void draw() {
+void showPictures() {
+  if(countSelection != countRef) thisImage = 0 ;
   // Empty, but needed to keep listening for keys
-  if (start && lastSecond != second() && second() % 20 == 0) {
+  if (!folderIsSelected && selectedPathFolder != ("") && lastSecond != second() && second() % 2 == 0) {
     File f = (File) imageFiles.get(thisImage);
     img = loadImage(f.getAbsolutePath());
     if (thisImage < imageFiles.size()-1) {
@@ -78,63 +36,16 @@ void draw() {
     image(img, 0, 0, width, height);
     lastSecond = second();
   }
+  countRef = countSelection ;
 }
 
-void keyPressed() {
-
-  if (key == ' ') {
-    start = true;
-  }
-}
 
-// This function returns all the files in a directory as an array of Strings  
-String[] listFileNames(String dir) {
-  File file = new File(dir);
-  if (file.isDirectory()) {
-    String names[] = file.list();
-    return names;
-  } 
-  else {
-    // If it's not a directory
-    return null;
-  }
-}
-
-// This function returns all the files in a directory as an array of File objects
-// This is useful if you want more info about the file
-File[] listFiles(String dir) {
-  File file = new File(dir);
-  if (file.isDirectory()) {
-    File[] files = file.listFiles();
-    return files;
-  } 
-  else {
-    // If it's not a directory
-    return null;
-  }
+void instruction() {
+  textAlign(CENTER);
+  background(255);
+  fill(0) ;
+  text("PRESS 'O' TO SELECT FOLDER", width/2, height/2);
 }
 
-// Function to get a list ofall files in a directory and all subdirectories
-ArrayList listFilesRecursive(String dir) {
-  ArrayList fileList = new ArrayList(); 
-  recurseDir(fileList, dir);
-  return fileList;
-}
 
-// Recursive function to traverse subdirectories
-void recurseDir(ArrayList a, String dir) {
-  File file = new File(dir);
-  if (file.isDirectory()) {
-    // If you want to include directories in the list
-    a.add(file);  
-    File[] subfiles = file.listFiles();
-    for (int i = 0; i < subfiles.length; i++) {
-      // Call this function on all files in this directory
-      recurseDir(a, subfiles[i].getAbsolutePath());
-    }
-  } 
-  else {
-    a.add(file);
-  }
-}