<script type = "text/javascript">
$(function(){
$(".mark1").change(function() {
var value = $(this).val();
var model = <?$_GET['model'];?>
$.ajax ({
url: "ajax/mark_model.php",
data: {'value':value,'model':model},
success: function(data){
$('.model1').html(data);
}
})
});
});
</script>