ajax function broke on Blackberry OS/6

I was using XUI javascript library for Blackberry web application (OS 4.7 and 5.0). I just tried code on Blackberry Bold with OS6.

Problem is that http ajax calls to remote server fail. No errors are shown, just calls do not w开发者_运维技巧ork. Programs works 100% with Mozilla and IE on desktop and older Blackberry models. Can anyone suggest a fix, or a better library? I do not need GUI that jQueryMobile offers.