jquery uncheck box code example
Example 1: jquery set checkbox checked unchecked
//jQuery 1.6+ use
$('.checkbox').prop('checked', true); //false for uncheck
//jQuery 1.5.x and below use
$('.checkbox').attr('checked', true); //false for uncheck
Example 2: jquery in checkbox checked
// Check a checkbox
$(selector).prop('checked', true);
// Un-check a checkbox
$(selector).prop('checked', false);
// Determine if checked or not
isChecked = $(selector).prop('checked');