(function($) {
    /*
     * Auto-growing textareas; technique ripped from Facebook
     */
    $.fn.autogrow = function(options) {

        this.filter('textarea').each(function() {

            var $this       = $(this),
                minHeight   = $this.height(),
                lineHeight  = $this.css('lineHeight');

            var shadow = $('<div></div>').css({
                position:   'absolute',
                top:        -10000,
                left:       -10000,
                width:      $(this).width() - parseInt($this.css('paddingLeft')) - parseInt($this.css('paddingRight')),
                fontSize:   $this.css('fontSize'),
                fontFamily: $this.css('fontFamily'),
                lineHeight: $this.css('lineHeight'),                resize:     'none'
            }).appendTo(document.body);

            var update = function() {

                var times = function(string, number) {
                    for (var i = 0, r = ''; i < number; i ++) r += string;
                    return r;
                };

                var val = this.value.replace(/</g, '&lt;')
                                    .replace(/>/g, '&gt;')
                                    .replace(/&/g, '&amp;')
                                    .replace(/\n$/, '<br/>&nbsp;')
                                    .replace(/\n/g, '<br/>')
                                    .replace(/ {2,}/g, function(space) { return times('&nbsp;', space.length -1) + 
' ' });

                shadow.html(val);
                $(this).css('height', Math.max(shadow.height() + 20, minHeight));

            }
            $(this).change(update).keyup(update).keydown(update);

            update.apply(this);

        });

        return this;

    }

})(jQuery);

$(document).ready(function() { $('textarea').autogrow(); });