<?php
$_SESSION['captcha']=rand(10000,99999);
$img=imagecreatetruecolor(100, 30);
imagefill($img, 0, 0, imagecolorallocate ($img, 255, 255, 255));
imagettftext ($img, 12, 0, 30, 20, imagecolorallocate ($img, 0, 0, 0), 'system/tahoma.ttf', "$_SESSION[captcha]");
header("Content-type: image/jpeg");
$img=MultiWave($img);
imagejpeg($img,null,20);
?>