สอบถามเกี่ยวกับการ GET ค่าที่ได้รับจาก List box ส่งไปยังไฟล์สร้างกราฟด้วย jpgraph

<SCRIPT LANGUAGE="JavaScript">
<!--
function refStr(){
	var x = Math.floor(Math.random() * 1000000);
	return "refreshstring="+x;
}
//-->
</SCRIPT>


<SCRIPT LANGUAGE="JavaScript">
<!--
	$(document).ready(function(){

		$('#txt_serch_graph').calendarsPicker({dateFormat:'dd-mm-yyyy'});


		$('#btn_serch').button();



		// --------------- Select Time BETWEEN ----------------	

		$("#btn_serch").click(function(){
			$.get("test_link.php?"+refStr(),
				{ option:"water_level", tao:"1750", pin:"1770"},
				function(data){
					//$("#wl").html("<img src=\"test_link.php\" title='tao_testo'>");
					$("#wl").html(data);
					
				}
			)
		});

	});


//-->
</SCRIPT>

<?
include ("src/jpgraph.php"); 
include ("src/jpgraph_bar.php"); 
include ("src/jpgraph_line.php");

include("common.php");

	$tao = $_GET['tao'];  //ตัวแปรที่ผม GET ค่าเข้ามาแล้วใช้งานไม่ได้
	$pin = $_GET['pin'];

	//$tao = 1750; // ตัวแปรที่ผมกำหนดค่าให้เหมือนกับค่าที่ GET เข้ามา แต่ตัวแปรนี้ใช้งานได้
	//$pin = 1770;


	$sql = "select * from graph where id between '$tao' and '$pin' order by id asc "; //แทรกในคำสั่ง sql
	$qry = mysql_query($sql);

	$time = array(); 
	while($rsl = mysql_fetch_array($qry)) { 

		$time[] = substr($rsl[time_date],0,5);
	} 


// ------------------ WL ------------------------

	$sql = "select * from graph where id between '$tao' and '$pin' order by id asc "; 
	$qry = mysql_query($sql);

	$wl = array(); 
	while($rsl = mysql_fetch_array($qry)) { 
		$wl[] = $rsl[wl];  
	} 

	


 
//--------------Size of the overall graph--------
	$width=450;
	$height=250;
	 
	// ---------Create the graph and set a scale.
	// These two calls are always required-------------
	$graph = new Graph($width,$height);
	$graph->SetScale('textlin');
	 
	// ---------Setup margin and titles-------------
	$graph->SetMargin(40,20,20,50);
	$graph->title->Set('Water Level');
	$graph->title->SetColor('#33CC00');
	$graph->subtitle->Set('(March 12, 2008)');
	$graph->subtitle->SetColor('#33CC00');
	$graph->xaxis->title->Set('Time()');
	$graph->xaxis->title->SetColor('red');
	$graph->xaxis->title->SetMargin(14);

	$graph->yaxis->title->Set('Water Level (m)');
	$graph->yaxis->title->SetColor('blue'); 
	 
	// ----------Create the linear plot-----------
	$lineplot=new LinePlot($wl);
	$lineplot->SetColor( '#336600' );
	//$lineplot->SetWeight( 2 );   // Two pixel wide
	$lineplot->mark->SetType(MARK_IMG_DIAMOND,5,0.2,4);
	$lineplot->mark->SetColor('blue');
	$lineplot->mark->SetFillColor('red');
	//$lineplot->value->Show();


	//------- Enable X and Y Grid-------
	$graph->xgrid->Show();
	$graph->xgrid->SetColor('[email protected]');
	$graph->xgrid->SetLineStyle('dashed');
	$graph->ygrid->SetColor('[email protected]');
	$graph->ygrid->SetLineStyle('dashed');

	//$graph->yaxis->SetColor('blue');
	//$graph->xaxis->SetColor('blue');


	$graph->xaxis->SetTickLabels($time);
	$graph->xaxis->SetFont(FF_COURIER,FS_NORMAL,8);
	$graph->xaxis->SetLabelAngle(90);
	 
	//---------- Add the plot to the graph-------
	$graph->Add($lineplot);
	 
	//---------- Display the graph--------------
	$graph->Stroke();

	

mysql_close($con);
?>