Easily done, with more than one solution. Before I post any code, I need more details:
Will this affect one content div on each page, or multiple divs?
If more than one, do they need to appear in the same place, which requires that showing any div must hide the previously displayed div or overwrite an existing div? Or will they be in different places?
Will you need to toggle the display on and off?
I'll check in tomorrow PM.