Bug 253242 Some help GIFs converted to PNG p=giacomo.magnini@portalis.it r=me

suite/locales/en-US/chrome/common/help/composer_help.xhtml

@@ -29,7 +29,7 @@
   <li>Click the Composer icon in the lower-left corner of any &brandShortName; window.</li>
 </ul>
 
-<div><img src="images/composer_icon.gif" width="128" height="23" alt="" /></div>
+<div><img src="images/composer_icon.png" width="128" height="23" alt="" /></div>
 <div style="margin-left: 80px;"><b>Composer icon</b></div>
 
 <div class="contentsBox">In this section:

suite/locales/en-US/chrome/common/help/customize_help.xhtml

@@ -286,7 +286,7 @@
   </tr>
   <tr> 
     <td colspan="2">
-      <img src="images/tabbed_browsing_bar.gif" alt="tab bar"/>
+      <img src="images/tabbed_browsing_bar.png" alt="tab bar"/>
     </td>
   </tr>
   <tr> 
@@ -400,7 +400,7 @@
   </tr>
   <tr>
     <td colspan="2">
-      <img src="images/tabbed_browsing_bar.gif" alt="tab bar"/>
+      <img src="images/tabbed_browsing_bar.png" alt="tab bar"/>
     </td>
   </tr>
   <tr>

suite/locales/en-US/chrome/common/help/help_help.xhtml

@@ -55,7 +55,7 @@
 	<p>To retrace your steps in Help, click the buttons near the top left corner of
 	  the Help window:</p>
 
-	<p><img src="images/help_nav.gif" alt="" width="124" height="38"/></p>
+	<p><img src="images/help_nav.png" alt="" width="124" height="38"/></p>
 
 	<ul>
 		<li>Click the Back button to move back through pages you have previously