How to automatically click a confirm box?

My script clicks an image on a site. The image has an anchor href and an onclick href, but the onclick href has a confirm box that pops up once it’s clicked.
The onclick HTML is:

onClick="this.href='link2';if (!confirm('Are you sure?')) { return false; }

How do I get the script to click OK in that confirm box, once it pops up?

I’m using this function to click the picture link:

function click(elm) {
 var evt = document.createEvent('MouseEvents');
 evt.initMouseEvent('click', true, true, window, 0, 1, 1, 1, 1, false, false, false, false, 0, null);
 elm.dispatchEvent(evt);
}
click(picture element)

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