Checkbox, unselect and select
<p>What I want is when checkbox1 is selected both checkbox labelled 1 will get selected and background will be removed</p>

<p><a href="http://jsfiddle.net/rigids/D2vCf/" rel="nofollow">here is the fiddle</a></p>

<p>for eg if i select checkbox1 it should select both checkbox labelled checkbox1</p>
