썸네일 생성 함수인데요.. 페이지 불러올때마다 새로 만들어지는것 같은데;;

어디서 주워온 함수인데요...
적용시켰는데 잘 되서 쓸려구 하는데 페이지 불러올대마다 재 생성 하는것같습니다.

좀 도와주세요;;

////////////////////////////////////

<?php
class thumbnails {
function ResizeImage($image, $newimage, $newwidth=0, $newheight=0) {
if (!function_exists('ImageTypes'))
return false;
list($width,$height,$type) = GetImageSize($image);
if ($im = self::ReadImageFromFile($image, $type)) {
if ($newwidth==0)
$newwidth = ($newheight / $height) * $width;
else if ($newheight==0)
$newheight = ($newwidth / $width) * $height;
elseif ($newheight && ($width < $height))
$newwidth = ($newheight / $height) * $width;
else
$newheight = ($newwidth / $width) * $height;

if (function_exists('ImageCreateTrueColor'))
$im2 = ImageCreateTrueColor($newwidth,$newheight);
else
$im2 = ImageCreate($newwidth,$newheight);

if (function_exists('imagealphablending'))
imagealphablending($im2, false);
if (function_exists('imagesavealpha'))
imagesavealpha ($im2 , true);

if (function_exists('ImageCopyResampled'))
ImageCopyResampled($im2,$im,0,0,0,0,$newwidth,$newheight,$width,$height);
else
ImageCopyResized($im2,$im,0,0,0,0,$newwidth,$newheight,$width,$height);

if (self::WriteImageToFile($im2, $newimage, $type))
return true;
}
return false;
}
private function ReadImageFromFile($filename, $type) {
$imagetypes = ImageTypes();
switch ($type) {
case 1 :
if ($imagetypes & IMG_GIF)
return $im = ImageCreateFromGIF($filename);
break;
case 2 :
if ($imagetypes & IMG_JPEG)
return ImageCreateFromJPEG($filename);
break;
case 3 :
if ($imagetypes & IMG_PNG)
return ImageCreateFromPNG($filename);
break;
default:
return 0;
}
}
private function WriteImageToFile($im, $filename, $type) {
switch ($type) {
case 1 :
return ImageGIF($im, $filename);
case 2 :
return ImageJpeg($im, $filename, 85);
case 3 :
return ImagePNG($im, $filename);
default:
return false;
}
}

}


//thumbnails::ResizeImage("00_folder.jpg", "mini/test.jpg", 150)

?>


////////////////////

불러오는 리스트 페이지에

if ($row["image1"] != "") {
thumbnails::ResizeImage("uploads/images/$row[image1]", "uploads/images/mini/$row[image1]", 150);
print("<td width=10><IMG src=uploads/images/mini/$row[image1]></td>");
}

//////////////////////////////

이렇게 했습니다.

이거 적용하는데 일주일 걸렸습니다 ,, 제발 좀 도와주세요 ㅠㅠ