jquery, unselect checkbox by value

i have many checkbox:

    <input type="checkbox" name="checkbox_user" value = "1"/>
    <input type="checkbox" name="checkbox_user" value = "2"/>   
    <input type="checkbox" name="checkbox_user" value = "3"/>
...

and checkbox with value 2 is selected. Is possible unselect checkbox (with jQuery) when i now only value.