Javascript question

I have this working,

this.setSrc(http://websitelink/images.jpg);

Now, I did make the url http://websitelink/images.jpg listed in JSON,

Now how can I change that code?
I want it to be like this:

this.setSrc(---json variable---);

Example of my JSON:

{"aaData":[
{"image":"http://websitelink/images.jpg","name":"picture1"}
]}