Set the background colour of the chart.
This goes into the <head> of the page:
<script type="text/javascript" src="js/swfobject.js"></script>
<script type="text/javascript">
swfobject.embedSWF(
"open-flash-chart.swf", "my_chart",
"550", "200", "9.0.0", "expressInstall.swf",
{"data-file":"gallery/background.php"} );
</script>
This writes the chart into a div with id="my_chart",
right click and view source to see it in action,
[the tutorials have
more details]
gallery/background.php
<?php
include '../php-ofc-library/open-flash-chart.php';
$data = array();
$data[] = 3;
$data[] = 8;
$data[] = 2;
$data[] = null;
$data[] = 5;
$bar = new bar();
$bar->set_values( $data );
$chart = new open_flash_chart();
$chart->set_title( new title( date("D M d Y") ) );
$chart->add_element( $bar );
$chart->set_bg_colour( '#FFFFFF' );
echo $chart->toPrettyString();