Getting MacBook Pro to boot regularly after installing Windows7

so installed windows 7 on 15'' macbook pro via. bootcamp. done , on windows 7. problem don't have installation disk , computer boots windows 7 without giving me choice. how make boot regularly without having installation disk?

 

hold down option key after startup sound.
in mac os x, go system preferences > startup disk , select macintosh hd startup disk, if want boot mac os x primarily.

 

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