Dialog helpness

[BRUTAL]

Anyone know how to do this;
heres a visual representation of the dialog

_________
|Red |
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_________
|Blue |
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_________
|Teal |
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_________
|Purple |
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_________
|Yellow |
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_________
|Orange |
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_________
|Green |
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_________
|Pink |
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_________
|>> |
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_________
|Back |
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_________
|Cancel |
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so it displays the first 8 players names, then has a scroll over button, which is the ">>"
back and cancel should be common sense
anyways when you press the scroll button it scrolls through players so, if it displayed 8 players; 1-8, it would now show players 9-12,1-4
so like...

_________
|Grey |
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_________
|LB |
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_________
|DG |
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_________
|Brown |
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_________
|Red |
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_________
|Blue |
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_________
|Teal |
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_________
|Purple |
----------
_________
|>> |
----------
_________
|Back |
----------
_________
|Cancel |
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so, yea. i don't really know how to put it in one word, but it scrolls through the players showing a maximum of 8

maybe using a global integer to remember values of something, idk ><