I94 Extension Denied

[informme]

My I-94 extension (for L1B visa) was denied on Oct '08 and I returned in 4 days after they updated Denial status. Reason for denail is "lack of specialized knowledge". I am planning to apply for L1B again in next month. Can you please advice me

- is it fine to apply for visa again as it will be more then 6 months after it was denied

- Do I need to show the copy of denial notice during visa interview? Is there any thread available providing suggestions for those applying for visa again after it was denied earlier...

Thanks in advance...

[orion]

Do you have specialized knowledge now?

[informme]

Yes, I have certification now. If any one please suggest me the better way to proceed to avoid rejection....