list menu ส่งค่าไป Jpgraph แล้วจะเรียกให้แสดงกราฟยังไงในโค้ดนี้ครับ

<script src="http://code.jquery.com/jquery-latest.js"></script>
		<select id="pagelist">
		<option value="">กรุณาเลือก</option>
		<option value="firstOption">กราฟ1</option>
		<option value="secondOption">กราฟ2</option>
		</select>

		<div id="firstOption" style="display:none">
		<form method="post" action="bar.php">
		<select name="month" id="month">
        <option value="">เดือน</option>
        <?php for($i = 1; $i <= 12; $i++){
				if($i < 10){ $temp = "0".$i; }else{ $temp = $i; }?>
        <option value="<?php echo $temp?>"> <?php echo $temp?></option>
        <?php }?>
        </select> 
		<select name="year" id="year">
		<?php for($i = 0; $i <= 10; $i++){?>  
					<option value="<?echo date("Y")-$i+543?>" ><?echo date("Y")-$i+543?></option>
		<?}?>
        </select>
		<input type="submit" />
		</form>
		</div>

		<div id="secondOption" style="display:none">
		<form method="post" action="baradult.php">
		<select name="month" id="month">
        <option value="">เดือน</option>
        <?php for($i = 1; $i <= 12; $i++){
				if($i < 10){ $temp = "0".$i; }else{ $temp = $i; }?>
        <option value="<?php echo $temp?>"> <?php echo $temp?></option>
        <?php }?>
        </select> 
		<select name="year" id="year">
		<?php for($i = 0; $i <= 10; $i++){?>  
					<option value="<?echo date("Y")-$i+543?>" ><?echo date("Y")-$i+543?></option>
		<?}?>
        </select>
		<input type="submit" />
		</form>
		</div>
		<script language="javascript">
		$("#pagelist").change(function(){
			var viewID = $("#pagelist option:selected").val();
		$("#pagelist option").each(function(){
		var hideID = $(this).val();
		$("#"+hideID).hide();
		});
		$("#"+viewID).show();	
		});
		</script>
<!--<?echo "<img src='bar.php'>";?> เรียกโชว์กราฟ-->

<?php
		include("config.php");
		include (".../jpgraph/jpgraph.php");
		include (".../jpgraph/jpgraph_bar.php");
		
		$m	= $_POST['month'];
		$y = $_POST['year']-(543);
		$name=พฤษภาคม;

		// ติดต่อ ฐานข้อมูล เลือกข้อมูลขึ้นมาเพื่อแสดงกราฟ
		$strSQL = "SELECT o.ot_code as ot_code, Count(t.ot_id) as count_ot_id FROM therapy AS t INNER JOIN ot AS o ON o.ot_id = t.ot_id
		WHERE MONTH(the_date) = $m AND YEAR(the_date) = $y GROUP BY o.ot_code";
		
		$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");

		// เตรียมข้อมุลที่จะแสดง เพื่อสร้างกราฟ
		//$datay=array();
		while($objResult = mysql_fetch_array($objQuery))
		{
		$datay[] = $objResult["count_ot_id"];
		$datax[] = $objResult["ot_code"];
		}
	
		// Create the graph. 
		$graph = new Graph(600,400);    
		
		$graph->SetScale("textlin");

		$graph->SetMarginColor('navy:1.9');
		$graph->SetBox();

		// Create and add a new text
		$txt=new Text('เดือน '.$name);
		$txt->SetPos(260,360);
		$txt->SetColor('darkred');
		$txt->SetFont(FF_ANGSA,FS_BOLD,15);
		$txt->SetBox('yellow','navy','[email protected]');
		$graph->AddText($txt);

		// Setup the titles
		$graph->title->Set('กราฟแสดงจำนวนผู้ป่วยต่อนักกิจกรรมบำบัด');
		$graph->xaxis->title->Set('OT');
		$graph->yaxis->title->Set('จำนวนผู้ป่วย');
		//$graph->yaxis->title->Set(10,20);

		$graph->title->SetFont(FF_ANGSA,FS_BOLD,16);
		$graph->yaxis->title->SetFont(FF_ANGSA,FS_BOLD,16);
		$graph->xaxis->title->SetFont(FF_ANGSA,FS_BOLD,16);

		$graph->title->Set('กราฟแสดงจำนวนผู้ป่วยต่อนักกิจกรรมบำบัด');
		$graph->title->SetFont(FF_ANGSA,FS_BOLD,18);

		$graph->SetTitleBackground('lightblue:1.3',TITLEBKG_STYLE2,TITLEBKG_FRAME_BEVEL);
		$graph->SetTitleBackgroundFillStyle(TITLEBKG_FILLSTYLE_HSTRIPED,'lightblue','blue');

		//Setup X-scale 

		 //$graph->xaxis->SetTextTickInterval(10); 
		//$graph->xaxis->SetTickLabels($datax); 
		//$graph->xtick_factor = 1; 
		//$graph->xaxis->SetLabelAngle(30); 
		//$graph->xaxis->SetTickLabels(array('OT1','OT2','OT3','OT6','OT7'));
		$graph->xaxis->SetTickLabels($datax);
		// Create a bar pot
		$bplot = new BarPlot($datay);
		$bplot->SetFillColor('darkorange');
		$bplot->SetWidth(0.6);

		$bplot->SetPattern(PATTERN_CROSS1,'navy');
		$graph->Add($bplot);
		$graph->Stroke();
?>