Need Mac to automatically boot as first partition (HELP)

hi guys, i have windows and mac on a different partition and i use Alt button to select,
How do i automatically make MAC my first partition to boot
any advice would be great!!
I should probs state that i am running on a Imac27" running on the I3 processor and have the latest MAC OS 10.6 or something like that (bought this mac about christmas so not too old!) 
jon

Hi,
boot your Mac into OSX.
In OSX go to System Preferences then Startup Volume and set your OSX volume to be the default.
On the next reboot your Mac should automatically boot into OSX.
To get to Windows again you would have to use the Alt/Option-key at startup.
Regards
Stefan

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