Bug 546775: Documentation should use html headings instead of PNGs

Add some styling for the "Related concepts", "Related tasks" and
"Related references" headings.

Change-Id: I159e99db534907a32aba317a0395e23eac666985
Signed-off-by: Matthias Becker <ma.becker@sap.com>
diff --git a/platform/org.eclipse.platform/book.css b/platform/org.eclipse.platform/book.css
index d3c40e1..3407d4d 100644
--- a/platform/org.eclipse.platform/book.css
+++ b/platform/org.eclipse.platform/book.css
@@ -106,3 +106,8 @@
 div.revision { border-left-style: solid; border-left-width: thin; 
 				   border-left-color: #7B68EE; padding-left:5 }
 th	     { font-weight: bold }
+
+
+.related {
+	color: #747474;
+}
\ No newline at end of file
diff --git a/platform/org.eclipse.sdk/book.css b/platform/org.eclipse.sdk/book.css
index b337d94..4e3b4a5 100644
--- a/platform/org.eclipse.sdk/book.css
+++ b/platform/org.eclipse.sdk/book.css
@@ -113,4 +113,8 @@
 	border-width: 0px;
 	border-style: none;
 	vertical-align: middle;
+}
+
+.related {
+	color: #747474;
 }
\ No newline at end of file