diff --git a/css/grafiken/back.jpg b/css/grafiken/back.jpg
deleted file mode 100644
index c576cee..0000000
Binary files a/css/grafiken/back.jpg and /dev/null differ
diff --git a/css/grafiken/back.png b/css/grafiken/back.png
new file mode 100644
index 0000000..2683c74
Binary files /dev/null and b/css/grafiken/back.png differ
diff --git a/css/grafiken/next.jpg b/css/grafiken/next.jpg
deleted file mode 100644
index fb7b56d..0000000
Binary files a/css/grafiken/next.jpg and /dev/null differ
diff --git a/css/grafiken/next.png b/css/grafiken/next.png
new file mode 100644
index 0000000..f8be106
Binary files /dev/null and b/css/grafiken/next.png differ