How Do I Get The Pop Up Image Or Onmouseover Image

[Guest]

I am using 3.0.17 and I have a problem enlarging my small product features. Below is the attachment that tells it all.

Small box is the product and what I need is to have a BIG pop up or onmouseover image as shown below.

Thanks in advance.

P/S : I followed all tutorals, changing images/uploads to 777 etc