What error messages are you getting? Can you post them on here.

As I postd earlier, this is d error msg am getting..

The image “http://localhost/filename.php” cannot be displayed, because it contains errors.

Please post the code for filename.php

This is d sample pgm I hav taken frm d tutorials..

<?php
include ("jpgraph.php" );
include ("jpgraph_line.php");

// Some data
$ydata=array(11,3, 8,12,5 ,1,9, 13,5,7 );

// Create the graph. These two calls are always required
$graph=new Graph(350, 250,"auto");
$graph->SetScale("textlin");

// Create the linear plot
$lineplot=new LinePlot($ydata);
$lineplot->SetColor("blue");

// Add the plot to the graph
$graph->Add($lineplot);

// Display the graph
$graph->Stroke();
?>

I think the class itself has the error.Try to check them more intensively to find out why it is not working.

put php_value output_buffering "0" in your .htaccess or

Set output_buffering=Off in php.ini file.

then
put ob_clean();
ob_end_clean();
in your image generating script.
Thats it.
Hope This will help you