var maxmchars = 1024;
      var message = "Message exceeds %n characters. Reduce it a little, please.";
      var error_message = "There has been an error sending the feedback message. Please try again later or not. ";
      var ftarea_updt_fp = function() {
        $("#feedback_msg").text($("#feedback_textarea")[0].value.length + " of max. " + maxmchars);
        if($("#feedback_textarea")[0].value.length > maxmchars) { $("#feedback_msg").css("color", "red"); }
        else { $("#feedback_msg").css("color", "gray"); }
      };

			$(function(){
				// Dialog			
				$("#feedback_dialog").dialog({
					autoOpen: false,
					width: 400,
					buttons: {
            "Ok": function() { 
              if($("#feedback_textarea")[0].value.length > maxmchars) {
                alert(message.replace("%n", maxmchars));
                $("#feedback_textarea")[0].focus();
              }
              else if($("#feedback_textarea")[0].value.length == 0) {
                $("#feedback_textarea")[0].focus();
              }
              else if($("#feedback_email")[0].value.length == 0) {
                $("#feedback_email")[0].focus();
              }
              else if(!$("#feedback_email")[0].value.match(".+@.+\\..+")) {
                alert("Please introduce a valid e-mail address!");
                $("#feedback_email")[0].focus();
              }
              else {
                // ajax permite gestionar respuesta erronea HTTP, post no:
                //$.post('/ajax/sendfbck.php', {message: $("#feedback_textarea")[0].value}, function(ok) {(ok==1)?$(this).dialog("close"):$('feedback_msg').text("There has been an error sending the feedback message. Please try again later or not.");});
                $("#feedback_msg").html("<img src=\"/jquery/css/ui-lightness/images/loader.white.gif\">");
                $.ajax({
                  type: "POST", 
                  url: "/ajax/addcomment.php", 
                  data: {
                    from: $("#feedback_email")[0].value,
                    message: $("#feedback_textarea")[0].value,
                    action: "PUT"
                  }, 
                  success: function(msg) {
                    if(msg=="ok") {
                      alert("Thanks for submitting your feedback!");
                      $("#feedback_dialog").dialog("close");
                      $("#feedback_dialog_link").css("color","gray");
                      $("#feedback_dialog_link").css("text-decoration","none");
                      $("#feedback_dialog_link").css("cursor","default");
                      $("#feedback_dialog_link").unbind("click");
                    }
                    else {
                      $("#feedback_msg").text(error_message + msg);
                    }
                  },
                  error: function(xmlobj,errdesc,excpobj) {
                    $("#feedback_msg").text(error_message + "(HTTP " + xmlobj.status + ")");
                    }
                });
              }
 			    		return false;
						}, 
						"Cancel": function() { 
							$(this).dialog("close"); 
						} 
					}
				});
				// Dialog Link
				$("#feedback_dialog_link").click(function() {
					$("#feedback_dialog").dialog('open');
          $("#feedback_msg").text("");
          ftarea_updt_fp();
					return false;
				});
        $("#feedback_textarea").keypress(ftarea_updt_fp);
        $("#feedback_textarea").keydown(ftarea_updt_fp);
        $("#feedback_textarea").keyup(ftarea_updt_fp);
        $("#feedback_textarea").change(ftarea_updt_fp);
        $("#feedback_textarea").click(ftarea_updt_fp);
 			});