Browser doesn't display applets (classes)

hi all,
i am sure every beginner faced the same problem
though i am not a beginner, i am facing this strange problem, and i can't figure out where the proble is .
i just started developing simple swing applications. first i want to try the examples given in a tutorial.
most of them are japplets (applets created by swing components)
Strange thing is that none of htem works on my browser WHICH DRIVES ME CRAZY !!
let me make my situation clearer:
i put the Japplet class file and the html file whick invokes the applet under the same directory
as far as i know , since they are in the same directory i don't need t to set the classpath , am i right?
well, if i open the html file directly from that directory, it can find the Japplet and it works
but when i put them in another directory under the root of tomcat 4 and try to access them through :
http://<hostaddress>:8080/applet.html
applet.html opens but can't find my applet class saying that app.class not found
the relevant html code is as follows:
<html>
<body>
<applet code=app.class width=100 height=50>
</applet>
</body>
</html>
what am i supposed to do?where am i wrong?
by the way to make sure i also added .; to my classpath
my OS is win 2000,
i am using jdk1.3.1
do i need something else to make them work
thanks for helping in advance :)
cheers :)

Is it a typing error or not.
Your html code is
<applet code=app.class width=100 height=50>Is this really the code you use?
I am missing the " "
<applet code="app.class" width=100 height=50>If you don't use the "", app.class can not be found.

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