function SubmitForm() {        
        var name = document.getElementById('name').value;
	    var email = document.getElementById('email').value;
	    var desc = document.getElementById('comments').value;
            $.ajax({
                type: "POST",
                url: "Feedback.aspx/SendMail?",
                 data: "{name:'" + name + "',email:'" + email +"',desc:'"+ desc +"'}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                error: OnError
            });

            function OnSuccess(data, status) {
                    if(data.toString() == "Success")
                        alert("Thank you for your feedback");	
                    else
                        alert("System error send feedback");	  
            }

            function OnError(request, status, error) {
                alert("System error send feedback");
               // alert(request.statusText);               
            }
        }