Thanks for the help. Ifound my own solution.
If anybody interested....

From SQL Analyzer

use msdb
select * from sysjobs ' find a job to update
update sysjobs set originating_server = 'current name of the server'
where job_id = 'id for that job'

After that there is no proble m to delete that job from EM interface.

Thanks to everybody 

This often happens when a server is renamed, because the jobs are seen as owned by the original server name, therefore are considered to be remotely managed. Have you tried searching this forum, as there have been several earlier discussions related to this problem, but I cannot remember the final outcome of them. 

Peter Kavanagh (MCT, MCSE, MCDBA)