I'm using check box in form. but when one check box is checked, show the detail div. and when multi check not show the div with jquery.

HTML code:

```
<input type="checkbox" name="cb1" id="cb1" />
<input type="checkbox" name="cb2" id="cb2" />
<input type="checkbox" name="cb3" id="cb3" />
<input type="checkbox" name="cb4" id="cb4" />
<div id="detail" style="display:none"></div>

```