$.fn.typewriter = function(opt,callback) {
        var i=0;
        var typeone = function(self, text, content) {
                if (text.length > 0) {
                        i=i+1;
                        var next = text.match(/(\s*(<[^>]*>)?)*(&.*?;|.?)/)[0];
                        text = text.substr(next.length);
                        $(self).html(content+next);
                        setTimeout(function(){
                                typeone(self, text, content+next);
                        }, opt['delay']);
                        if(text.length==0) if (callback!=null) callback();
                }
        }
        this.each(function() {
                opt = opt || { 'delay': 150 };
                typeone(this, $(this).html(), '');
        });
        return this;
}