applet won't run across server

I am a JAVA beginner and I have made an applet compiled it and am calling the .class file with html page. It works perfectly on my pc in IE and firefox. The problem is that when I uploaded the files to a server they no longer work...just a red X and a applett failed message in the status bar.....

any suggestions / help would be great! Thanks

[356 byte] By [brandie1a] at [2007-10-3 9:27:54]
# 1
give the url where the applet is
mkoryaka at 2007-7-15 4:42:14 > top of Java-index,Java Essentials,New To Java...
# 2
http://www.brandierumford.com/rumfordHW6.html
brandie1a at 2007-7-15 4:42:14 > top of Java-index,Java Essentials,New To Java...
# 3
no clue. here is how i loaded an applet once: http://www.absoluteabandon.com/mk/NeuralNetCheckerAI/it seems that its different with a jar file.nice website though
mkoryaka at 2007-7-15 4:42:14 > top of Java-index,Java Essentials,New To Java...
# 4

I see this in the Java console:

java.lang.ClassFormatError: Extra bytes at the end of class file RumfordHW6

This looks to me like RumfordHW6.class has been corrupted when

moved to the server. How did you move it? Did you use BINARY FTP?

Try to make absolutely sure your file and the server file are the same.

baftosa at 2007-7-15 4:42:14 > top of Java-index,Java Essentials,New To Java...
# 5
I cant view the .class files.....atleast I don't know how....I uploaded the files with my hosts uploading page....it is binary not sure if its ftp....
brandie1a at 2007-7-15 4:42:14 > top of Java-index,Java Essentials,New To Java...