function send() {
var name = document.getElementById('name');
var link = document.getElementById('link');
var comment = document.getElementById('comment');
var a_id= document.getElementById('a_id');
var topic= document.getElementById('topic');
if (name.value == '') {
alert('please complete your name');
} else if (comment.value == '') {
alert('please complete your comment');
} else if (comment.value.length < 10) {
alert('your comment is too short!');

} else {
$.get('comment/add.php',

{ n: name.value, l: link.value, c: comment.value, t: topic.value, a: a_id.value },

function(result) {

if (result == 0) {

alert('خطأ!');

} else {

alert('thanks !');

$(result).appendTo('#comments');

comment.value = '';

}});
}
}