change ogg option to altSource to indicate WebM support

Author: johnpolacek

example-ogg.html

@@ -27,7 +27,7 @@
 	    $(function() {
             var BV = new $.BigVideo({useFlashForFirefox:false});
 			BV.init();
-			BV.show('vids/river.mp4', {ogg:'vids/river.ogv'});
+			BV.show('vids/river.mp4', {altSource:'vids/river.ogv'});
 	    });
     </script>
 </body>

index.html

@@ -59,12 +59,12 @@ <h2>Setup</h2>
     BV.init();
     BV.show('http://video-js.zencoder.com/oceans-clip.mp4');
 });</pre></blockquote></p>
-            <p>For best results in Firefox, create an Ogg version of your video and configure BigVideo.js like this:</p>
+            <p>For best results in Firefox, create an Ogg version of your video and configure BigVideo.js like this (works for WebM also):</p>
 <p><blockquote><pre>
 $(function() {
     var BV = new $.BigVideo({useFlashForFirefox:false});
     BV.init();
-    BV.show('vids/river.mp4', {ogg:'vids/river.ogv'});
+    BV.show('vids/river.mp4', {altSource:'vids/river.ogv'});
 });</pre></blockquote></p>
         </div>
 

js/bigvideo.js

@@ -287,8 +287,8 @@
 				if (ext === 'jpg' || ext === 'gif' || ext === 'png') {
 					showPoster(source);
 				} else {
-					if (options !== undefined && options.ogg && navigator.userAgent.toLowerCase().indexOf('firefox') > -1) {
-						source = options.ogg;
+					if (options !== undefined && options.altSource && navigator.userAgent.toLowerCase().indexOf('firefox') > -1) {
+						source = options.altSource;
 					}
 					playVideo(source);
 					isQueued = false;