想联系一下php缩略图，代码及错因如下，求大神指点

Question

<?php $image=imagecreatefromjpeg("E:tp/city.jpg"); $height=imagesy($image); $width=imagesx($image); $after_height=$height*0.5; $after_width=$width*0.5; $after=imagecreatetruecolor($after_width, $after_height); imagecopyresampled($after, $image, 0,0,0,0, $after_width, $after_height, $width, $height); imagejpeg($after,"E:tp/after.jpg",100); imagedestroy($after);?><b>使用php创建缩略图</b><table> <tr> <td>原图：</td> <td>缩图：</td> </tr> <tr> <td><img src="E:tp/city.jpg"/ ></td> <td><img src="E:tp/after.jpg"/></td> </tr></table>错因：[Web浏览器] "Not allowed to load local resource: file:///E:/tp/city.jpg" /phptext1/gd.php (8)[Web浏览器] "Not allowed to load local resource: file:///E:/tp/after.jpg" /phptext1/gd.php (9)