Fixing layout to match other pref panels. r=matt

xpfe/components/prefwindow/resources/content/pref-advanced.xul

@@ -28,20 +28,15 @@
 		xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         onload="return StartUp('Advanced');"
         class="dialog"
-        align="horizontal" title="&window.title;">
+        align="vertical" title="&window.title;"
+		debug="false">
 
 
 <html:script language="javascript" src="chrome://pref/content/PrefsWindow.js"/>
-<html:div flex="100%">
-
-
-	<box id="header" align="horizontal">  
-		  <spring style="width:20px"/>
-		  <html:div style="vertical-align: middle;">
-		  <html:B>&lHeader;</html:B>
-		  </html:div>
-   		  <spring flex="100%"/><spring style="width:20px" /> 
-		  <html:div align="right">&rHeader;</html:div><spring style="width:5px"/>
+<box class="header" align="horizontal">  
+      <titledbutton class="left-header-text" value="&lHeader;"/>
+	  <spring class="header-spring" flex="1"/>
+	  <titledbutton class="right-header-text" value="&rHeader;"/>
 </box>
 
 
@@ -138,5 +133,4 @@
 	</html:fieldset> 
 </box>  
 
-</html:div>
 </window>