Lazy friends, that cannot access some images, because of firewalls at their work. Lazy because they cannot code a simple way around. :(

simpleimageproxy.php

<?php
try {
    $image_path = $_GET['image'];

    if (strlen($image_path) < 4){
        echo 'n/a';
        return;
    }

    $http = substr($image_path, 0, 4);
    if (strtolower($http) != 'http') {
        echo "Http missing from path";
        return;
    }

    $image_name = basename($image_path);
    $file_extension = substr($image_name, (strlen($image_name) - 3));
    $file_extension = strtolower($file_extension);

    if ($file_extension == 'jpg' || $file_extension == 'png' ||
        $file_extension == 'gif' || $file_extension == 'jpeg') {
        header('Content-Type: image/jpeg');
        echo file_get_contents($image_path);
    } else {
        echo "Wrong file extension. Is it a picture?";
    }
} catch (Exception $e) {
    @error_log(json_encode($e->getTrace()));
    echo 'nice try.';
}