Category Archives: Webapps

Online Whiteboard

At ScRiBLink you’ll find a free, powerful whiteboard where you and your colleagues can work on your ideas together.
No registration is required : )
Additional features like
– picture upload
– chat
– math functions
– multiple users
– ….
give you a good base to start sharing concepts online, etc..
Note: Maybe it’s not working behind corporate firewalls because it uses additional tcp ports.
Online Whiteboard
If you know about alternatives, please comment.

Critical Bug in Joomla 1.5.5 (and older 1.5.x versions)

The password of the user with the lowest ID (typically an administrator) can be reset by an unauthorized user in Joomla 1.5.x installations prior version 1.5.6 because of a bug in the password remind functionality.

All 1.5.x installations prior to and including 1.5.5 are affected

The Joomla developer team advises to upgrade to 1.5.6 (or patch the /components/com_user/models/reset.php file with the code below).

After global $mainframe; on line 113 of reset.php, add:

if(strlen($token) != 32) {
    return false;

See: Joomla! Developer – Password Remind Functionality

WordPress / enabling (built in) cache

Edit wp-config.php and add
define('ENABLE_CACHE', true);

Create the directory cache in the folder wp-content/ (take care it’s writeable!)

If you want to take control about expiration time, you can do this including these lines in wp-config.php:

That’s all : )
The next time, your blog is being visted, the pages will be cached..
B.t.w.: You can empty the cache directory every time you want (in case of trouble, etc..).

More infos: (de) (de)

Update (!):
The file-based caching mechanism has been removed from the WordPress 2.5 code. Detailed infos at

Save and convert flash streams

If you want to convert a flash stream into a more comfortable format, that can be saved on your local disc and be played by most software/hardware, here’s a short guide:

Save your prefered video (from i.e. YouTube, MyVideo, etc.) with KeepVid.

When FFmpeg is installed, the conversion in Linux is quite simple:
ffmpeg -i input.flv -ab 128 -ar 44100 -b 900 \
-s 640x480 output.mpg

-b = videobitrate
-ab = audiobitrate
-ar = audiosamplerate (Hz)
-s = framesize width * height