line graph doesn't appear in the page. the only thing that appears in the page instead of the line graph is a text "Chart.". i cant figure out what is wrong with my code.. 
  
  
  
 
include("../Includes/FusionCharts.php");
include("../Includes/DBConn.php");
$patientID = $_GET['patientID'];
$strXML = "";
$get_das = mysql_query("SELECT DISTINCT DASSCORE, CONSULTDATE FROM CONSULTATION WHERE PATIENTID='$patientID' ORDER BY CONSULTDATE ASC");
	  $index = 0;
	  if(mysql_num_rows($get_das) == 0){
	  	 echo "asa";
	  }
	  else{
	  	while($get_result = mysql_fetch_array($get_das, MYSQL_NUM))
			{
			$das_index[$index] = $get_result[0];
			$date[$index] = $get_result[1];
			$strXML .= "";
                               $index++;
			}
		}
$strXML .= "";
echo renderChart("../FusionCharts/FCF_Line.swf", "", $strXML, "", 600, 300);
 
  
  
  
please help me with these. thanks.