Metrics about an Image on my Blog - Google Analytics?

[precisonstriking]

I have a blog where I have advertising down the side in the form of text and an image, as soon as you click on the image you will be taken to the company's website. I'm wondering how often this image is being clicked on but I can't seem to find that data in my google analytics. I'm not sure if it is trackable or if I'm just not looking in the right place.
My blog is http://www.precisionstriking.ca and the image I'm referring to is the Gorilla Fight Gear image on the middle right side.
I want to justify the value of this add by tracking click through rates. Can anybody help me?

[Ross]

You can use Goals by Google Analytics. You'll need to put the Goal code on a page which then redirects onto the company website though instead of just linking to that site directly.