Image Compression Problem

[AMT India]

I have an image resizing function using GD Library in php.After resizing the gif images,they lose their animation properties.
[code=php]

$file_name_src = $upload_file;
$file_desinatio n2 = $compressedPath ;

list($width_ori g, $height_orig, $type) = getimagesize($f ile_name_src);


if($type == "1" )
{
$image = imagecreatefrom gif($file_name_ src);

}
elseif ($type=="2")
{
$image = imagecreatefrom jpeg($file_name _src);
}
elseif($type==" 3")
{
$image = imagecreatefrom png($file_name_ src);
}
//echo $image."<br/>";
$new_width = $new_width;
$new_height = $new_height;

if ($new_width && ($width_orig < $height_orig))
{
$new_width = ($new_height / $height_orig) * $width_orig;
}
else
{

$new_height = ($new_width / $width_orig) * $height_orig;
}





// Resample
$image_p = imagecreatetrue color($new_widt h, $new_height);

//echo $image_p."<br/>";
imagecopyresamp led($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);

//echo $file_desinatio n2;



if (function_exist s("imagegif") )
{
//header("Content-type: image/gif");
imagegif($image _p,$file_desina tion2);
}
elseif (function_exist s("imagejpeg" ))
{
imagejpeg($imag e_p, $file_desinatio n2, 100);
}
elseif (function_exist s("imagepng") )
{
imagepng($image _p,$file_desina tion2);
}
elseif (function_exist s("imagewbmp" ))
{
imagewbmp($imag e_p,$file_desin ation2);
}
else
{
die("No image support in this PHP server");

}
imagedestroy($i mage_p);
chmod($file_des ination2,0655);

return true;
[/code]

Regards,
AMTIndia