Help with PHP fundraising thermometer

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I have downloaded a script that generates a fundraising thermometer and have no idea ho to integrate into my site.

The purpose is so people can see how much money has been raised so far and how much is needed.

What I want to know is how the script is updated the the image changes as the fund increases.  Is it connected to a database?  There has to be something telling it how much money has been raised.

Here is the script in full:

[code]<?
/*
    Fundraising Thermometer Generator v1.1
    Sairam Suresh sai1138@yahoo.com / www.entropyfarm.org
   
    NOTE - you must include the full path to the truetype font on your system below
            if you want text labels to appear on your graph. No TrueType fonts are
            included in this package, you can probably find some on your system or
            else download one off the net.
     

    Inputs: 'unit'    - the ascii value of the currency unit. By default 36 ($)
                        other interesting ones are:
                          163:  British Pound
                          165:  Japanese Yen
                          8355: French Franc
                          8364: Euro

            'max'    - the goal
            'current' - the current amount raised

    Versions:
    1.2 - added a 'burst' image on request, cleaned up the images a little bit.
    1.1 - Internationalized :) added 'unit' at a user's request so other currencies could be used.
    1.0 - intial version

*/
error_reporting(7); // Only report errors
Header("Content-Type: image/jpeg");

function code2utf($num){
//Returns the utf string corresponding to the unicode value
//courtesy - romans@void.lv
if($num<128)return chr($num);
if($num<2048)return chr(($num>>6)+192).chr(($num&63)+128);
if($num<65536)return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128);
if($num<2097152)return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128). chr(($num&63)+128);
return '';
}

#$font = "/usr/local/fonts/ttf/arial.ttf";
$font = "c:/windows/fonts/georgia.ttf";

$unit = ($HTTP_GET_VARS['unit']) ? $HTTP_GET_VARS['unit'] : 36; // ascii 163 = $
$t_unit = ($unit == 'none') ? '' : code2utf($unit);
$t_max = ($HTTP_GET_VARS['max']) ? $HTTP_GET_VARS['max'] : 0;
$t_current = isset($HTTP_GET_VARS['current']) ? $HTTP_GET_VARS['current'] : 0;

$finalimagewidth = max(strlen($t_max),strlen($t_current))*25;
$finalimage = imagecreateTrueColor(60+$finalimagewidth,405);

$white = imagecolorallocate ($finalimage, 255, 255, 255);
$black = imagecolorallocate ($finalimage, 0, 0, 0);
$red = imagecolorallocate ($finalimage, 255, 0, 0);

imagefill($finalimage,0,0,$white);
ImageAlphaBlending($finalimage, true);

$thermImage = imagecreatefromjpeg("therm.jpg");
$tix = ImageSX($thermImage);
$tiy = ImageSY($thermImage);
ImageCopy($finalimage,$thermImage,0,0,0,0,$tix,$tiy);

/*
  thermbar pic courtesy http://www.rosiehardman.com/
*/
$thermbarImage = ImageCreateFromjpeg('thermbar.jpg');
$barW = ImageSX($thermbarImage);
$barH = ImageSY($thermbarImage);


$xpos = 5;
$ypos = 327;
$ydelta = 15;
$fsize = 12;


// Set number of $ybars to use, calculated as a factor of current / max.
if ($t_current > $t_max) {
    $ybars = 25;
} elseif ($t_current > 0) {
    $ybars = $t_max ? round(20 * ($t_current / $t_max)) : 0;
}

// Draw each ybar (filled red bar) in successive shifts of $ydelta.
while ($ybars--) {
    ImageCopy($finalimage, $thermbarImage, $xpos, $ypos, 0, 0, $barW, $barH);
    $ypos = $ypos - $ydelta;
}

if ($t_current == $t_max) {
    ImageCopy($finalimage, $thermbarImage, $xpos, $ypos, 0, 0, $barW, $barH);
    $ypos -= $ydelta;
}

// If there's a truetype font available, use it
if ($font && (file_exists($font))) {
    imagettftext ($finalimage, $fsize, 0, 60, 355, $black, $font,$t_unit."0");                // Write the Zero
    imagettftext ($finalimage, $fsize, 0, 60, 10+(2*$fsize), $black, $font, $t_unit."$t_max");  // Write the max
    if ($t_current > $t_max) {
        imagettftext ($finalimage, $fsize+1, 0, 60, $fsize, $black, $font, $t_unit."$t_current!!"); // Current > Max
    } elseif($t_current != 0) {
        if ($t_current == $t_max) {
            imagettftext ($finalimage, $fsize, 0, 60, 10+(2*$fsize), $red, $font, $t_unit."$t_max!");  // Current = Max
        } else {
            if (round($t_current/$t_max) == 1) {
                $ypos += 2*$fsize;
            }
            imagettftext ($finalimage, $fsize, 0, 60, ($t_current > 0) ? ($ypos+$fsize) : ($ypos+(4*$fsize)), ($t_current > 0) ? $black : $red, $font, $t_unit."$t_current");  // Current < Max
        }
    }
}

if ($t_current > $t_max) {
    $burstImg = ImageCreateFromjpeg('burst.jpg');
    $burstW = ImageSX($burstImg);
    $burstH = ImageSY($burstImg);
    ImageCopy($finalimage, $burstImg, 0,0,0,0,$burstW, $burstH);
}

Imagejpeg($finalimage);
Imagedestroy($finalimage);
Imagedestroy($thermImage);
Imagedestroy($thermbarImage);

?>[/code]