Some more screenshots cleanup/refactoring

gallery.html

@@ -44,8 +44,8 @@
 
         <ul class="rig columns-4">
           <li>
-            <a href="gallery/win7-2.png">
+            <a href="gallery/win7.png">
-              <img src="gallery/win7-2_prev.png" width="200" height="271" alt="" />
+              <img src="gallery/win7_prev.png" width="200" height="267" alt="" />
             </a>
             <h3>Windows 7</h3>
             <p>GPXSee on Windows 7</p>
@@ -62,8 +62,8 @@
             <h3>Mac OS&nbsp;X</h3>
             <p>GPXSee on OS&nbsp;X</p>
           </li><li>
-            <a href="gallery/lin1.png">
+            <a href="gallery/linux.png">
-              <img src="gallery/lin1_prev.png" width="200" height="275" alt=""/>
+              <img src="gallery/linux_prev.png" width="200" height="275" alt=""/>
             </a>
             <h3>Linux</h3>
             <p>GPXSee on Linux</p>