// JScript File
function countChars(obj, len){
    var text = obj.value; 
    var info = $(obj).next("div.info").children("div.message");
    if (obj.value.length>len)
    { 
        obj.value = obj.value.substr(0,len);
        info.html('Restanti: 0');
    }
    info.html('Restanti: ' + (len - obj.value.length));
}

 
$(document).ready(
    function()
    {
        $('textarea').each(
            function(el)
            {
                var info = $(this).next("div.info")
                if (info!=null)
                    info.append("<div class=\"message\"></div>");
                $(this).bind("keyup", function(){countChars(this, 512);});
                $(this).trigger('keyup');
            });
    }
 );