adding scroll bar to modal/popup window

Hello, I am wanting to to set a fixed width and height to a popup and have a scroll bar that will allow viewers to see all the content. I have put all my code in jsfiddle at this location

I would also like to know how to set the modal to popup in the center of your viewing area. if this is to much to ask, maybe a direction to some documentation on it.

thank you very much in advance

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nishant joshiTechnology Development ConsultantCommented:
#boxes .window{
#boxes #dialog{padding:10px;background-color:#badf92;}
#boxes #dialog2{padding:10px; margin-top:15px;background-color:#badf92;}
#boxes #dialog3{padding:10px;background-color:#badf92;}
Kyle HamiltonData ScientistCommented:
Here it is centered.

(I changed the width and height of the .window just so it's visible what's going on - change it to whatever you like.)

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jaxbrianAuthor Commented:
thank you very much
Kyle HamiltonData ScientistCommented:
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