Yes, this is a real bonified Pop-up Window...
Well, sort of . You have to click to make it pop up.
(I did that out of courtesy)
I could make it pup up as soon as you drag your mouse over the screen, but you don't want that.

Here's how:

(The color is just here because it's convenient. the real text is all black... unless you have Dreamweaver.)

1) Type in Your Link and extra text
2) Make it a link to ... whatever
3) Find where your code has

extra text <a href="http://www.whateversite.org/Page.html">Your Link</a>
extra text. <br>

4) Copy in this code just below that code

extra text <href="" onclick="MM_openBrWindow('http://www.whateversite.org/Page.html','PageTitle','scrollbars=yes,width=500,height=400,top=300,left=600')">Your Link</a> extra text.<br>

4) Modify it as appropriate
      a) Move http://www.whateversite.org/Page.html from within the section of your code into the color matched section of the new code.
      b) Move  extra text and Your Link into position the same way
      c) Change the Other Stuff to match what you want

5) Delete the original code

6) Save it, and you're on your way.

Pretty simple huh? There's more stuff you can do, but I'll let you explore that on your own.

Happy Codeing : )