If GeoGebra extension does not find the geoGebra.jar file at www.geogebra.at/webstart, it looks for the file at the places where MediaWiki stores the media files (i.e. *.jpg). So if you have installed a MediaWiki at a local server (wamp, lamp, server2go,...) e.g. for testing purposes, you can use GeoGebra extension offline, that means, without connection to the web.
New parameter useLocalJar. For testing purposes, you can force the extension to use the geogebra.jar file locally installed (this means, geogebra.jar uploaded to your MediaWiki) instead of using the one from www.geogebra.at/webstart.
Parameter "name" added.
Add function function url_exists() to check, if acces to remote applet is possible.
url_exists() replaces the old code with fopen. The old code didn't work correctly at wikis with allow_url_fopen off.
allow_url_fopen is set in php.ini. Some internet service providers do not grant access to php.ini.
If geogebra.jar is not found at www.geogebra.at, or if using useLocalJar="true", GeoGebra extension looks for geogebra.jar at another place:
Version 1.0u looked for geogebra.jar in the file repository of the wiki. This caused problems, when geogebra.jar changed to be only a starter for other geogebra*.jar files, e.g. geogebra_main.jar, geogebra_gui.jar etc.
Version 2.0p now looks for geogebra.jar in the /extension/GeoGebra subdirectory of the wiki. So you have to upload all geogebra*.jar files using FTP.
A minor change was necessary, because $_SERVER['DOCUMENT_ROOT'] did not work correctly.
