IE users: If there is a grey box, do you have the latest Java Virtual Machine or your latest web browser? Check for any product updates from Microsoft here.
However, we do recommend using Sun's more up-to-date version of Java, which can be located here: http://www.java.com/en/download/manual.jsp
Netscape users: If there is a white box with a 3-colored icon of a cone, a square and a circle, you will need to clear your browser cache then reload your web browser.
If the applet loads, but won't run, check to see if there is an error in the applet by placing your mouse over the applet box. If there is a message in the status bar like "Class: xxxxx not found," clear your browser cache, then reload your web browser.