jQuery.fn.maxlength = function(){   
    $("textarea[maxlength]").keypress(function(event) {   
        var key = event.which;   
    
        if(key >= 33 || key == 13) {   
            var maxLength = $(this).attr("maxlength");   
            var length = this.value.length;   
            if(length >= maxLength) {   
  
                event.preventDefault();   
            }   
        }   
    });   
}