Javascript validation

 $(document).ready(function(){
        $('#send_message').click(function(e){

            //Stop form submission & check the validation
            e.preventDefault();

            // Variable declaration
            var error = false;
            var lname = $('#lname').val();
            var fname = $('#fname').val();
            var mname = $('#mname').val();
            var alias = $('#alias').val();
            var place = $('#place').val();
            var address = $('#address').val();
            var nationality = $('#nationality').val();
            var age = $('#age').val();
            var complexion = $('#complexion').val();
            var height = $('#height').val();
            var weight = $('#weight').val();
            var build = $('#build').val();
            var haircolor = $('#haircolor').val();
            var pecularities = $('#pecularities').val();
            var other = $('#other').val();
            var clname = $('#clname').val();
            var cfname = $('#cfname').val();
            var cmname = $('#cmname').val();
            var caddress = $('#caddress').val();

            var email = $('#email').val();
            var subject = $('#subject').val();
            var message = $('#message').val();

            // Form field validation
            if(lname.length == 0){
                var error = true;
                $('#lname_null').fadeIn(500);
            }else{
                $('#lname_null').fadeOut(500);
            }
            if(!lname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#lname_error').fadeIn(500);
            }else{
                $('#lname_error').fadeOut(500);
            }
            if(fname.length == 0){
                var error = true;
                $('#fname_null').fadeIn(500);
            }else{
                $('#fname_null').fadeOut(500);
            }
            if(!fname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#fname_error').fadeIn(500);
            }else{
                $('#fname_error').fadeOut(500);
            }
            if(mname.length == 0){
                var error = true;
                $('#mname_null').fadeIn(500);
            }else{
                $('#mname_null').fadeOut(500);
            }
            if(!mname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#mname_error').fadeIn(500);
            }else{
                $('#mname_error').fadeOut(500);
            }
            if(alias.length == 0){
                var error = true;
                $('#alias_null').fadeIn(500);
            }else{
                $('#alias_null').fadeOut(500);
            }
            if(!alias.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#alias_error').fadeIn(500);
            }else{
                $('#alias_error').fadeOut(500);
            }
            if(place.length == 0){
                var error = true;
                $('#place_null').fadeIn(500);
            }else{
                $('#place_null').fadeOut(500);
            }
            if(!place.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#place_error').fadeIn(500);
            }else{
                $('#place_error').fadeOut(500);
            }
            if(address.length == 0){
                var error = true;
                $('#address_null').fadeIn(500);
            }else{
                $('#address_null').fadeOut(500);
            }
            if(!address.match(/^[a-zA-Z0-9 #-]*$/)){
                var error = true;
                $('#address_error').fadeIn(500);
            }else{
                $('#address_error').fadeOut(500);
            }
            if(nationality.length == 0){
                var error = true;
                $('#nationality_null').fadeIn(500);
            }else{
                $('#nationality_null').fadeOut(500);
            }
            if(!nationality.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#nationality_error').fadeIn(500);
            }else{
                $('#nationality_error').fadeOut(500);
            }
            if(age.length == 0){
                var error = true;
                $('#age_null').fadeIn(500);
            }else{
                $('#age_null').fadeOut(500);
            }
            if(!age.match(/^[0-9]*$/)){
                var error = true;
                $('#age_error').fadeIn(500);
            }else{
                $('#age_error').fadeOut(500);
            }
            if(complexion.length == 0){
                var error = true;
                $('#complexion_null').fadeIn(500);
            }else{
                $('#complexion_null').fadeOut(500);
            }
            if(!complexion.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#complexion_error').fadeIn(500);
            }else{
                $('#complexion_error').fadeOut(500);
            }
            if(height.length == 0){
                var error = true;
                $('#height_null').fadeIn(500);
            }else{
                $('#height_null').fadeOut(500);
            }
            if(!height.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#height_error').fadeIn(500);
            }else{
                $('#height_error').fadeOut(500);
            }
            if(weight.length == 0){
                var error = true;
                $('#weight_null').fadeIn(500);
            }else{
                $('#weight_null').fadeOut(500);
            }
            if(!weight.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#weight_error').fadeIn(500);
            }else{
                $('#weight_error').fadeOut(500);
            }
            if(build.length == 0){
                var error = true;
                $('#build_null').fadeIn(500);
            }else{
                $('#build_null').fadeOut(500);
            }
            if(!build.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#build_error').fadeIn(500);
            }else{
                $('#build_error').fadeOut(500);
            }
            if(haircolor.length == 0){
                var error = true;
                $('#haircolor_null').fadeIn(500);
            }else{
                $('#haircolor_null').fadeOut(500);
            }
            if(!haircolor.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#haircolor_error').fadeIn(500);
            }else{
                $('#haircolor_error').fadeOut(500);
            }
            if(pecularities.length == 0){
                var error = true;
                $('#pecularities_null').fadeIn(500);
            }else{
                $('#pecularities_null').fadeOut(500);
            }
            if(!pecularities.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#pecularities_error').fadeIn(500);
            }else{
                $('#pecularities_error').fadeOut(500);
            }
            if(other.length == 0){
                var error = true;
                $('#other_null').fadeIn(500);
            }else{
                $('#other_null').fadeOut(500);
            }
            if(!other.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#other_error').fadeIn(500);
            }else{
                $('#other_error').fadeOut(500);
            }
            if(clname.length == 0){
                var error = true;
                $('#clname_null').fadeIn(500);
            }else{
                $('#clname_null').fadeOut(500);
            }
            if(!clname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#clname_error').fadeIn(500);
            }else{
                $('#clname_error').fadeOut(500);
            }
            if(cfname.length == 0){
                var error = true;
                $('#cfname_null').fadeIn(500);
            }else{
                $('#cfname_null').fadeOut(500);
            }
            if(!cfname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#cfname_error').fadeIn(500);
            }else{
                $('#cfname_error').fadeOut(500);
            }
            if(cmname.length == 0){
                var error = true;
                $('#cmname_null').fadeIn(500);
            }else{
                $('#cmname_null').fadeOut(500);
            }
            if(!cmname.match(/^[a-zA-Z]*$/)){
                var error = true;
                $('#cmname_error').fadeIn(500);
            }else{
                $('#cmname_error').fadeOut(500);
            }
            if(caddress.length == 0){
                var error = true;
                $('#caddress_null').fadeIn(500);
            }else{
                $('#caddress_null').fadeOut(500);
            }
            if(!caddress.match(/^[a-zA-Z0-9 #-]*$/)){
                var error = true;
                $('#caddress_error').fadeIn(500);
            }else{
                $('#caddress_error').fadeOut(500);
            }
            if(email.length == 0 || email.indexOf('@') == '-1'){
                var error = true;
                $('#email_error').fadeIn(500);
            }else{
                $('#email_error').fadeOut(500);
            }
            if(subject.length == 0){
                var error = true;
                $('#subject_error').fadeIn(500);
            }else{
                $('#subject_error').fadeOut(500);
            }
            if(message.length == 0){
                var error = true;
                $('#message_error').fadeIn(500);
            }else{
                $('#message_error').fadeOut(500);
            }

            // If there is no validation error, next to process the mail function
            if(error == false){
               // Disable submit button just after the form processed 1st time successfully.
                $('#send_message').attr({'disabled' : 'true', 'value' : 'Sending...' });

                /* Post Ajax function of jQuery to get all the data from the submission of the form as soon as the form sends the values to email.php*/
                $.post("email.php", $("#contact_form").serialize(),function(result){
                    //Check the result set from email.php file.
                    if(result == 'sent'){
                        //If the email is sent successfully, remove the submit button
                         $('#submit').remove();
                        //Display the success message
                        $('#mail_success').fadeIn(500);
                    }else{
                        //Display the error message
                        $('#mail_fail').fadeIn(500);
                        // Enable the submit button again
                        $('#send_message').removeAttr('disabled').attr('value', 'Send The Message');
                    }
                });
            }
        });
    });