Bug 319344 hPrefWindow is called as a function, but is an object. patch by ssitter@googlemail.com, r=jminta

calendar/resources/content/pref/prefBird.xul

@@ -33,7 +33,7 @@
 			flex="1"
 			seltype="single"
 			hidecolumnpicker="true"
-			onselect="hPrefWindow();">
+			onselect="hPrefWindow.switchPage();">
 			<treecols>
 				<treecol id="categoryCol"
 					flex="1"