Thanks Trent,

I´ll follow your suggestion about using triggers

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I would like to change the world, but they don´t give me the source code.
MS Windows 7 Ultimate 64-Bit
Intel(R) Core(TM)2 Quad CPU Q9300 2.50 GHz
6.00 GB of RAM, NVIDIA GeForce 9800 GT

MacBook Pro i5 OSX Lion