T-SQL to Disable/Enable Job in SQL Server 2005
From the msdb..sysjobs, the required job_id for enable or disable to be taken.
select * from msdb..sysjobs
T-SQL to dis-enable specific job in sql server
EXEC msdb..sp_update_job @job_id = '770F175B-C8A0-4157-BACD-0AF129DF570C', @enabled = 0
T-SQL to enable specific job in sql server
EXEC msdb..sp_update_job @job_id = '770F175B-C8A0-4157-BACD-0AF129DF570C', @enabled = 1