is there any way to or code that, could Options

[n00b]

me and my friend were thinking on a layout site:
before they could click any link (comment, layout, or anything, or if they left) with not subbing there would be a million of those error popups annoying them.

that would probably be annoying, but it would be useful.
is there any way to do that? or any code?
or is there a way to make a code like that?
hmm..
I wouldn't be sure on xanga
but I know how to do something similar on a website.

or if someone could "make" the code.
it actually would be very useful.