The java plugin is installed by default in slackware. It doesn't work because mozilla doesn't know it exists.<br />
<br />
To fix it, do the following as root:<br />
<pre>ln -sf /usr/lib/jdk1.5.0_01/jre/plugin/i386/ns7/libjavaplugin_oji.so <b>/usr/local</b>/mozilla/plugins</pre>
<br />
Note that the path to mozilla is different on my system because I don't use slackware packages for mozilla. Do the following to find your mozilla directory and replace it in the above command:<br />
<pre>find / -name mozilla 2&gt; /dev/null</pre>
<br />
Enjoy.