Textarea Auto Resize

s.js

/*
* Auto resizing textarea
* Usage: <textarea class="autoresize"></textarea>
*/
var textareaAutoResize = function textareaAutoResize(minHeight){
    var txt = $('.autoresize'),
        hiddenDiv = $(document.createElement('div')),
        content = null,
        mH = minHeight || 50;
    txt.css({overflow:'hidden',minHeight:mH});
    hiddenDiv.css({
        display: 'none', whiteSpace: 'pre-wrap', minHeight: mH,
        overflow: 'hidden', wordWrap: 'break-word', fontFamily: txt.css('font-family'),
        fontSize: txt.css('font-size'), padding: txt.css('padding'), width: txt.css('width')
    });
    $('body').append(hiddenDiv);
    txt.bind('keyup', function() {
        content = txt.val();
        content = content.replace(/\n/g, '<br>');
        hiddenDiv.html(content);
        txt.css('height', hiddenDiv.height());
    });
};