$(document).ready(function(){
    $('title').text('new title');
});

It's working every broswer except IE.

$(document).ready(function(){
    $(document).attr('title','new title');
});

It's working in all broswer.

But I think jQuery should be smart to get/set the title when I use the " $('title').text('new title');" in IE. Because title should be tag not attribute of page