You can schedule both dts packages to run in one job...
if (datepart(dd,getdate()) = 15 )OR (datepart(dd,getdate()) = 1 )
BEGIN
EXEC XP_CMDSHELL 'DTSRUN.... FORTNIGHT DTS PACKAGE..' --OR you can configure the another job for fortnight dts and start the job in this step using sp_start_job....
END
ELSE
BEGIN
EXEC XP_CMDSHELL 'DTSRUN.... DAILY ORTNIGHT DTS PACKAGE..'
END
MohammedU
Microsoft SQL Server MVP