显示mysql中存放的图片问题

我写的两个脚本,用来从mysql中取得图片的二进制串,并显示出来,但总是出现问题,如果换成显示其他字段均正常,不知是不是代码有问题
1.php
<?
mysql_connect("localhost","root","123456");


@mysql_select_db("iimage");


$result=mysql_query("SELECT * FROM image");


while($row=mysql_fetch_object($result))
{

echo "<img src=\"2.php? pic=$row->id\">";


}
?>

2.php
<?
mysql_connect("localhost","root","123456");


@mysql_select_db("iimage");

$result=mysql_query("SELECT * FROM image WHERE id=".$pic);


$row=mysql_fetch_object($result);

header( "Content-type: image/pic");

echo $row->img; //字段类型BLOB

?>