Fix lack of return value.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@383 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -674,7 +674,7 @@ OpenLayers.Util.alphaHack = function() {
     var arVersion = navigator.appVersion.split("MSIE");
     var version = parseFloat(arVersion[1]);
     
-    var alphaHack = ( (document.body.filters) &&
+    return ( (document.body.filters) &&
                       (version >= 5.5) && (version < 7) );
 }