Thanks to Roel Collignon who posted this answer (Step by step guide):
First things first; download your waveplugin: http://joomlacode.org/gf/project/waveplugin/frs/
1. Go to your joomla website and install this plugin. And while you're there activate this plugin right away (plugin management)
2. Make a new wave in your wave client
3. Press the + sign next to Manage contacts and add: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
4. You will get some sort of script in your wave like this:
var wave = new WavePanel('https://wave.google.com/wave/');
wave.setUIConfig('white', 'black', 'Arial', '13px');
wave.loadWave('googlewave.com!w+Ec7eho08B');
wave.init(document.getElementById('wave'));
5. Go to your administrator environment of your joomla website and copy the next line (remove space between "{" and "googlewave"):
{ googlewave id=ID HERE|width=700px|height=500px|bg=#99CCFF|fcolor=#000033|fsize=14px}
6. copy from your new wave from the code embeddy gave to you the line googlewave.com!w+...... etc. stop before the ' and paste it in joomla were it says ID HERE
NEXT STEP IS WHEN YOU WANT TO MAKE YOUR WAVE ACCESSABLE FOR ALL (PUBLIC WAVE)
7. Press the + sign next to Manage contacts and add: This e-mail address is being protected from spambots. You need JavaScript enabled to view it (ignore the message of no wave account)
Congratulations You just installed a wave into google. Now to completely embed it into you website you can modify the next parameters of your Joomla code:
bg: background color (e.g. bg=#000)
fcolor: font color (e.g. #FF3300)
ffamily: font family (e.g. Georgia, sans-serif)
fsize: font size (e.g 12px or 12pt)
Yes, it's that easy!
