Why this js is not working?

Hi there
This is my jsfiddle.net
http://jsfiddle.net/vngx/phbmf3zd/13/
I want to get value of radio Button and show an alert message when value is changed

But its not working

Look at the console.

There is something wrong with this line:

alert('Value is:'+bla);

@James_Hibbard was correct. Look at the correct JSFiddle here

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