Lazyload Images Defect on Blackberry Browser w/ OS <= 5

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Enable this filter --> lazyload_images 
(https://developers.google.com/speed/docs/mod_pagespeed/filter-lazyload-images)

What is the expected output? What do you see instead?
The images didn't showing, because the blackberry browser on OS 5 below aren't 
supported by default. See 
https://www.google.com/search?q=javascript+support+blackberry+os+5

What version of the product are you using (please check X-Mod-Pagespeed
header)?
mod-pagespeed-beta-1.3.25.3-2556.x86_64

On what operating system?
CentOS 6.3

Which version of Apache?
Server version: Apache/2.2.15 (Unix)

Which MPM?
*don't know*

URL of broken page:
http://www.lintas.me

Original issue reported on code.google.com by dewangg...@xtremenitro.org on 9 Mar 2013 at 7:22