Need Mutually Exclusive Checkbox

[Google Code Exporter]

I have created a jsfiddle [ http://jsfiddle.net/georgeneil/dEbRg/ ] to 
implement mutually exclusive checkbox. But it has some issues.

Step 1: When i click CheckBox2 its working as expected.

Step 2: when i click CheckBox1 its not getting checked. But on the next click 
it works.

Can someone guide me how to fix it.

Original issue reported on code.google.com by [e-mail] on 23 Jul 2012 at 9:06