Trying to build a jQuery map- click function not working

Trying to build a jQuery map- click function not working

Hi all,
I'm trying to make some code so that when a user clicks on a picture, a image will be displayed where it was clicked (i.e the x and y co ordinates). Anyway, so I started writing it but my code doesn't seem to work, so I'd like to see what I've done wrong.

It's in the document.ready function.

$("img.world").click(function() { alert("clicked"); };

And the image which I want clicked has an id of "world".

Cheers,