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.

 
 
                $file_name_src =  $upload_file;
            $file_desination2 = $compressedPath;
 
              list($width_orig, $height_orig, $type) = getimagesize($file_name_src);
 
 
                if($type == "1" )
                {
                    $image = imagecreatefromgif($file_name_src);
 
                }
                elseif ($type=="2")
                {
                    $image = imagecreatefromjpeg($file_name_src);
                }
                elseif($type=="3")
                {
                    $image = imagecreatefrompng($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
                $image_p = imagecreatetruecolor($new_width, $new_height);
 
                //echo $image_p."<br/>";
                imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
 
                //echo $file_desination2;
 
 
 
                    if (function_exists("imagegif"))
                    {        
                        //header("Content-type: image/gif");
                        imagegif($image_p,$file_desination2);
                    }
                    elseif (function_exists("imagejpeg"))
                    {
                        imagejpeg($image_p, $file_desination2, 100);
                    } 
                    elseif (function_exists("imagepng"))
                    {
                        imagepng($image_p,$file_desination2);
                    }
                    elseif (function_exists("imagewbmp")) 
                    {
                        imagewbmp($image_p,$file_desination2);
                    } 
                    else 
                    {
                        die("No image support in this PHP server");
 
                    }
                     imagedestroy($image_p);
                     chmod($file_desination2,0655);
 
                    return true;
 

Regards,
AMTIndia