How to set the order of boot in my pc?, I have Windows Vista, XP, Linux XU buntu

Expert ah, experrt....
I have installed three operating systems in my pc for different purpose use.
Now everytime when the pc start, there will be an option there ask me to choose which operating systems I wan to go to.
Then after 10 sec if I not choosing it will automaticaly load to my Linux (which is the first option boot currently)
How to set the order of boot in my pc?
I have Windows Vista, XP, Linux XU buntu

Now my curent first boot is Linux, I wan my first boot to be Vista?
How to do it? Pls guide if you know. Thax

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