Pass variable into PHP via JAax

[nareh]

<?php
include('header.php'); 
		require_once('/homepages/9/d322999378/htdocs/spaincoastrealty/wordpress_en/wp-admin/includes/image.php');
        require_once("/homepages/9/d322999378/htdocs/spaincoastrealty/wordpress_en/wp-load.php");
		global $wpdb;
        global $posts;
?> <form id = "test" method = "post"> <div> <div class="control-group"> <label class="control-label" for="selectError">Site</label> <div class="controls"> <select name="sitechooser" id="sitechooser"> <option value="Site1" selected>Site1</option> <option value="Site2">Site2</option> </select> </div> </div> </div> <input type = "text" id = "site_value" value = "some text"> </form> <script>
		$(document).ready(function (e) {
			
                $('#sitechooser').change(function () {
                    var selected = $("#sitechooser option:selected").text();
                    if (selected == "Site1") {
	
						var id = $('#site_value').val();
						$.ajax({
								url: 'try.php',
								dataType: 'JSON',
								data: {id: id},
								success: function(data){
									alert(data);
									id = data.id;
									$('#id').text(id);
							}
						});
                    } 
				
				});
		});		
		</script> <?php
	
		echo "id = ".$id;
		
		?>

I want to get id value in php $id variable.

Is something wrong in my code? THanks

[Dormilich]

$_GET["id"] .