Normally with SSIS you would do this using SSIS configurations or by setting a variable value using the command line options. Here are a couple of resources:
http://consultingblogs.emc.com/jamiethomson/archive/2007/03/13/SSIS_3A00_-Property-Paths-syntax.aspx
http://msdn.microsoft.com/en-us/library/cc895212.aspx
Jack Corbett
Consultant - Straight Path Solutions
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