Ok, blank.pbm is free to go.

The rest of these are new or replaced.  The buttons are now all the same
width.  They have the transparency set right.  They still need the attention
of a designer.  But they work, and we have a real button for the Modules
Index.
diff --git a/Doc/icons/blank.pbm b/Doc/icons/blank.pbm
deleted file mode 100644
index 3c72463..0000000
--- a/Doc/icons/blank.pbm
+++ /dev/null
@@ -1,4 +0,0 @@
-P4
-# CREATOR: XV Version 3.00  Rev: 3/30/93
-1 1
-
\ No newline at end of file
diff --git a/Doc/icons/contents_motif.gif b/Doc/icons/contents_motif.gif
index 7b3c904..afa2a17 100644
--- a/Doc/icons/contents_motif.gif
+++ b/Doc/icons/contents_motif.gif
Binary files differ
diff --git a/Doc/icons/index_motif.gif b/Doc/icons/index_motif.gif
index b9b3108..eb87b44 100644
--- a/Doc/icons/index_motif.gif
+++ b/Doc/icons/index_motif.gif
Binary files differ
diff --git a/Doc/icons/modules_motif.gif b/Doc/icons/modules_motif.gif
new file mode 100644
index 0000000..0add775
--- /dev/null
+++ b/Doc/icons/modules_motif.gif
Binary files differ
diff --git a/Doc/icons/next_motif.gif b/Doc/icons/next_motif.gif
index 928a32d..be1f585 100644
--- a/Doc/icons/next_motif.gif
+++ b/Doc/icons/next_motif.gif
Binary files differ
diff --git a/Doc/icons/previous_motif.gif b/Doc/icons/previous_motif.gif
index c38778c..6599b5b 100644
--- a/Doc/icons/previous_motif.gif
+++ b/Doc/icons/previous_motif.gif
Binary files differ
diff --git a/Doc/icons/up_motif.gif b/Doc/icons/up_motif.gif
index c7c9cf7..6ead538 100644
--- a/Doc/icons/up_motif.gif
+++ b/Doc/icons/up_motif.gif
Binary files differ