Unloading iFrames

[cclloyd9785]

I was going to make a set of pages where it has a universal wrapper, and the individuality pages would load in iframes. Would it be better on the computer/browser to load and unload iframes as they are visible, so that if you view them all, they wouldn't all be loaded at once? If so, I was told by a friend you could do so with JS, but how would I go about doing so? I will take guides but would prefer a more direct answer.