add Barnes & Noble link; use InformIT logo

Change-Id: I4f65efcfe1c95177a31a7ca2db07ec70a340e95b

index.html

@@ -46,9 +46,12 @@ hr {
 <td>
   <a href='http://www.informit.com/store/go-programming-language-9780134190440'><img border='1' src="cover.png" height='600'/></a>
   <br/>
-  <a href='http://www.amazon.com/dp/0134190440?tracking_id=disfordig-20'><img border='0' width='150' src="buyfromamazon.png"/></a>
-  <span style='vertical-align:35%'>|</span>
-  <a href='http://www.informit.com/store/go-programming-language-9780134190440'/><span style='vertical-align:35%'>Order print or e-book from publisher</span></a>
+  <div style='text-align: center'>
+  <a href='http://www.amazon.com/dp/0134190440'><img border='0' width='150' src="buyfromamazon.png"/></a>
+  &nbsp;&nbsp;&nbsp;
+  <a href='http://www.informit.com/store/go-programming-language-9780134190440'/><img border='0' height='26' src="informit.png"/></a>
+  &nbsp;&nbsp;&nbsp;
+  <a href='http://www.barnesandnoble.com/w/1121601944'><img border='0' width='150' src="barnesnoble.png"/></a>
   </div>
 </br>
 </td>