Right click are disabled here, so just click ctrl+u to view the source. There you will see that a flash file are included:
<pre class="brush: xml;">
<object type="application/x-shockwave-flash" data="level2.swf" width="300" height="200">
<param name="movie" value="level2.swf" />
<param name="bgcolor" value="#FFFFFF" />
</object>
</pre>View the source of the flash file by entering this in the address bar in your browser: view-source:http://try2hack.nl/levels/level2.swf Here you will see the username and password among the mess.
txtUsername
try2hack
txtPassword
irtehh4x0r!