my graphs aren't displaying in Chrome any more!

[MMD]

For some reason the graphs I built for my website many years ago no longer work in Chrome. They work when viewed on their own... they work even when embedded in the website (for a few seconds), then they disappear?? Seem to work fine in IE.

The graphs are on this page.... at the bottom....
http://finestfootball.co.uk/predictionleague/wycombewanderers

Here is the code from one of the graphs... any ideas??

<?php

// This array of values is just here for the example.
	$wins = $_GET['wins'];
	$draws = $_GET['draws'];
	$losses = $_GET['losses'];
	
    $values = array($wins, $draws, $losses);

// Get the total number of columns we are going to plot

    $columns  = count($values);

// Get the height and width of the final image

    $width = 300;
    $height = 200;

// Set the amount of space between each column

    $padding = 5;

// Get the width of 1 column

    $column_width = $width / $columns ;

// Generate the image variables

    $im        = imagecreate($width,$height);
    $gray      = imagecolorallocate ($im,75,166,221);
    $gray_lite = imagecolorallocate ($im,0xee,0xee,0xee);
    $gray_dark = imagecolorallocate ($im,10,37,66);
    $white     = imagecolorallocate ($im,0xff,0xff,0xff);
    
// Fill in the background of the image

   imagefilledrectangle($im,0,0,$width,$height,$white);
    
    $maxv = 0;
	
	

// Calculate the maximum value we are going to plot

    for($i=0;$i<$columns;$i++)$maxv = max($values[$i],$maxv);

// Now plot each column
        
    for($i=0;$i<$columns;$i++)
    {
        $column_height = ($height / 100) * (( $values[$i] / $maxv) *100);

        $x1 = $i*$column_width;
        $y1 = $height-$column_height;
        $x2 = (($i+1)*$column_width)-$padding;
        $y2 = $height;

        imagefilledrectangle($im,$x1,$y1,$x2,$y2,$gray);

// This part is just for 3D effect

        imageline($im,$x1,$y1,$x1,$y2,$gray_dark);
        imageline($im,$x1,$y2,$x2,$y2,$gray_dark);
        imageline($im,$x2,$y1,$x2,$y2,$gray_dark);
		imageline($im,$x2,$y1,$x1,$y1,$gray_dark);
	

    }
		imageline($im,0, 199, 400, 199,$gray_dark);
		
		imagettftext($im, 18, 90, 50, 190, $gray_dark, "arial.ttf", "Wins  " . $wins);
		imagettftext($im, 18, 90, 150, 190, $gray_dark, "arial.ttf", "Draws  " . $draws);
		imagettftext($im, 18, 90, 250, 190, $gray_dark, "arial.ttf", "Losses  " . $losses);

// Send the PNG header information. Replace for JPEG or GIF or whatever

    header ("Content-type: image/png");
    imagepng($im);
?>

to embed them on the page I use the following code..

$total = $wins + $draws + $losses;
$winspercentage = number_format($wins / $total * 100, 1 );
$drawspercentage = number_format($draws / $total * 100, 1 );
$lossespercentage = number_format($losses / $total * 100, 1 );

echo "<br /><img src=\"graph.php?wins=$wins&losses=$losses&draws=$draws\" /><br />";