Adding images folder
diff --git a/user_guide/images/nav_bg_darker.jpg b/user_guide/images/nav_bg_darker.jpg
new file mode 100644
index 0000000..816efad
--- /dev/null
+++ b/user_guide/images/nav_bg_darker.jpg
Binary files differ
diff --git a/user_guide/images/nav_separator_darker.jpg b/user_guide/images/nav_separator_darker.jpg
new file mode 100644
index 0000000..a09bd5a
--- /dev/null
+++ b/user_guide/images/nav_separator_darker.jpg
Binary files differ
diff --git a/user_guide/images/nav_toggle_darker.jpg b/user_guide/images/nav_toggle_darker.jpg
new file mode 100644
index 0000000..eff33de
--- /dev/null
+++ b/user_guide/images/nav_toggle_darker.jpg
Binary files differ
diff --git a/user_guide/images/smile.gif b/user_guide/images/smile.gif
old mode 100755
new mode 100644
Binary files differ