Just a gray square

I am developing a sketch pad applet and have tested it several times from the "run project" option in JBuilder. Everything looks fine there. Now when I try to use the applet through an html page the aplet appears as a gray box, nothing more. The Internet Explorer says that the class has started so there are no exceptions thrown. What is the major problem? My main class implements several other classes and have many instances of my own classes inside it. All classes are copied to the directory where the main class is put.

When I look at the java console in Internet Explorer I
see whats the problem. Its all about getting access to files on the
server. I get a java.net.SocketPermission.
In my code I call getImage(url) to get an image from my server.
I set the image file properties with chmod 777 but it doesn't
seem to be enough when I use an absolute path to the server.
And Im not able to use a relative path as an url in my code.
How can I get permission to my files on the server from
the applet classes.

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