I want to get checkbox with specfic value and make it checked..

I make like this

$(":checkbox").filter({"value":5}).attr("checked","true");?

and here is the html

?<input type="checkbox" name="priv"????????????????????????????? value="1"?????????????????/>
<input type="checkbox" name="priv" value="2"/>
<input type="checkbox" name="priv" value="3"/>
<input type="checkbox" name="priv" value="4"/>
<input type="checkbox" name="priv" value="5"/>
<input type="checkbox" name="priv" value="6"/>
<input type="checkbox" name="priv" value="7"/>
 <input type="checkbox" name="priv" value="8"/>?

here's a demo of the problem