Answers for "check by jquery"

jQuery check a radio button

// jQuery version 1.6 or above use:  
$("#myRadioID").prop("checked", true);
 
//jQuery versions below 1.6 use:
$("#myRadioID").attr('checked', 'checked');

jquery set checkbox

//jQuery 1.6+ use:
$('.checkboxClass').prop('checked', true);
//jQuery 1.5.x and below use:
$('.checkboxClass').attr('checked', true);