Fix minor script things.

scripts/generate-pages.py

@@ -43,9 +43,8 @@ def thumbnail_url(link):
 def setup_directory_structure(settings, base_dir, template_dir):
     site_new_dir = os.path.join(base_dir, 'site-new')
     os.mkdir(site_new_dir)
-    extern_dir = os.path.join(base_dir, 'extern')
     extern_dir_site = os.path.join(site_new_dir, 'extern')
-    os.symlink(extern_dir, extern_dir_site)
+    os.symlink(os.path.join('..', 'extern'), extern_dir_site)
 
     style = read(os.path.join(template_dir, 'style.css'))
     style_out = style.replace('{', '{{').replace('}', '}}') \
@@ -83,19 +82,20 @@ def generate_video_section_html(section_html, media):
 def extern_video(file_src):
     url = '../extern/' + file_src
     return '''\
-<video src="{file_src}" controls height="427">
+<video src="{url}" controls height="427">
 Your browser cannot play this video.  You can download it here instead:
-<a href="{file_src}">{file_src}</a>
+<a href="{url}">{url}</a>
 </video>
-'''.format(file_src=file_src)
+'''.format(url=url)
 
 def youtube_video(file_src):
+    yt_id = file_src
     return '''\
 <iframe type="text/html" width="760" height="427"
-        src="https://www.youtube.com/embed/{file_src}?controls=2"
+        src="https://www.youtube.com/embed/{yt_id}?controls=2"
         allowfullscreen frameborder="0">
 </iframe>
-'''.format(file_src=file_src)
+'''.format(yt_id=yt_id)
 
 def generate_video_page(base_dir, out_dir, base_html, showing_html, media):
     title = media['title']