detect « addClass « jQuery Q&A

1. Browser detection and addClass    stackoverflow.com

This doesn't work

if( $.browser.opera ){
    $("body").addClass('opera');
}

2. jQuery Detect iPad, change font-size of element    stackoverflow.com

I need to change the font-size of some elements if the user is on the iPad because the iPad renders my navigation bar off screen (due to some unknown font enlargement ...