看看小弟我在注册码不显示。显示为红叉。哪位高手帮忙解决下

/**

* TestGuest Version1.0

* ================================================

* Copy 2010-2012 yc60

* Web: http://www.yc60.com

* ================================================

* Author: Lee

* Date: 2010-8-13

*/

session_start();



//随机码的个数

$_rnd_code = 4;



//创建随机码

for ($i=0;$i<$_rnd_code;$i++) {

	$_nmsg .= dechex(mt_rand(0,15));

}



//保存在session

$_SESSION['code'] = $_nmsg;



//长和高

$_width = 75;

$_height = 25;



//创建一张图像

$_img = imagecreatetruecolor($_width,$_height);



//白色

$_white = imagecolorallocate($_img,255,255,255);



//填充

imagefill($_img,0,0,$_white);



$_flag = false;



if ($_flag) {

	//黑色,边框

	$_black = imagecolorallocate($_img,0,0,0);

	imagerectangle($_img,0,0,$_width-1,$_height-1,$_black);

}



//随即画出6个线条

for ($i=0;$i<6;$i++) {

	$_rnd_color = imagecolorallocate($_img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

	imageline($_img,mt_rand(0,$_width),mt_rand(0,$_height),mt_rand(0,$_width),mt_rand(0,$_height),$_rnd_color);

}



//随即雪花

for ($i=0;$i<100;$i++) {

	$_rnd_color = imagecolorallocate($_img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));

	imagestring($_img,1,mt_rand(1,$_width),mt_rand(1,$_height),'*',$_rnd_color);

}



//

$_rnd_color = imagecolorallocate($_img,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));
imagestring($_img,5,$i*$_width/$_rnd_code+mt_rand(1,10),mt_rand(1,$_height/2),$_SESSION['code'][$i],$_rnd_color);
}

//输出图像
header('Content-Type: image/png');
imagepng($_img);

//销毁
imagedestroy($_img);






?>



有高人吗？ Color

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------解决方案--------------------
不会是直接include吧？

要写成形式
而且外部的php也要session_start