checkbox act like a radio button code:

jQuery:
jQuery('.chck').click(function(){
jQuery('.chck:checked').not(this).removeAttr('checked');
});

html:

<input class="chck" type="checkbox" name="chckBox"/> Mr.

<input class="chck" type="checkbox" name="chckBox"/> Mrs.

<input class="chck" type="checkbox" name="chckBox"/> Ms.