(function($){
     $.fn.extend({
         limit: function(limit,element) {

			var interval, f;
			var self = $(this);

			$(this).focus(function(){
				interval = window.setInterval(substring,100);
			});

			$(this).blur(function(){
				clearInterval(interval);
				substring();
			});

			substringFunction = "function substring(){ var val = $(self).val();var length = val.length;if(length > limit){$(self).val($(self).val().substring(0,limit));}";
			if(typeof element != 'undefined')
				substringFunction += "if($(element).html() != limit-length){$(element).html((limit-length<=0)?'0':limit-length);}"

			substringFunction += "}";

			eval(substringFunction);

			substring();

        }
    });
})(jQuery);