An update to the slackware j2sdk package changes the location of the java library:<br />
<pre>/usr/lib/jdk1.5.0_03/jre/plugin/i386/ns7/libjavaplugin_oji.so</pre><br />
And I guess if you don't have the sdk installed you can use the plugin from JRE:<br />
<pre>/usr/lib/jre1.5.0_03/plugin/i386/ns7/libjavaplugin_oji.so</pre>