CooTank is running with following setings

<APPLET CODE="cootank.class"  CODEBASE="classes/cootank" Archive="cootank.jar" WIDTH=500 HEIGHT=400>
<param name=screenW value= "500">
<param name=screenH value= "400">
<param name=popup value= "0">
<param name=popup value= "0">
<param name=soundFile value= "sound/bubble.au">
<param name=links1 value= "http://www.coolshare.com/websurf|Somewhere out there...^#^http://www.coolshare.com/savers|The best screen savers in the world: from insect to outer space...^#^http://www.coolshare.com/work|Here is Mark's web work: is it cool?^#^http://www.coolshare.com/applets|Tons of FREE and cool java applets, Beans, and application over there...Click and cool your site there...">
<param name=links2 value= "http://www.coolshare.com/applets|Tons of FREE and cool java applets, Beans, and application over there...Click and cool your site there...^#^http://www.coolshare.com/link_ex.htm|A place to cool your site...^#^http://www.coolshare.com/link_app.htm|Mark's applet in the real world.^#^http://www.coolshare.com/html/webz_p.htm|A zoo...where you learn web...">
<param name=evnFiles1 value= "1|1|1|3|3|3|3">
<param name=evnFiles2 value= "0|1|0|floor.gif">
<param name=evnFiles3 value= "1|1|0|bubble.gif">
<param name=evnFiles4 value= "2|1|0|tips.gif">
<param name=evnFiles5 value= "3|5|2|fish21.gif|fish22.gif|fish23.gif|fish24.gif|fish25.gif|fish26.gif|fish27.gif">
<param name=evnFiles6 value= "4|5|0|shell11.gif|shell12.gif|shell13.gif|shell14.gif|shell15.gif">
<param name=evnFiles7 value= "5|4|0|horse11.gif|horse12.gif|horse13.gif|horse14.gif">
<param name=evnFiles8 value= "6|6|0|jelly11.gif|jelly12.gif|jelly13.gif|jelly14.gif|jelly15.gif|jelly16.gif">
<param name=waterFill value="1"> 
<param name=keyShutDown value="0"> 
<param name=goPass value="1">
<param name=openAsStart value="0">
<param name=tankBgColor value="000000"> 
<param name=randomFish value="1">
<param name=offWhenLeave value="0">
</APPLET>






After a while, if you don't see anything above(only a dark square)
or see an error message in the status bar like: 


     java.lang.NoClassDefFoundError
     java.lang.NoSuchMethodError 

that means that you are using a browser older than 4.x or a Netscape which doesn't fully support JDK1.1.
You can upgrade your netscape so that it fully supports JDK1.1. 
Or simply switch to IE 4.x!!