Hi again.successful compilation of a java code doesn't guarrantee a successful run,so i suggest you try to first run the applet by using the appletViewer,say appletViewer Beans.html in your command line on your cmd after compilatiion.
This will display the applet in html format.if it displays,then your code will have to be carefully looked into but if it doesn't,dont use the applet anymore because there might be some classes and methods used that are in packages created and used only by them(where you downloaded it from).Besides it is advisable to design your own applets than to download due to this problems.
if you still have the same problem,kindly send me a copy of your code so that i can see what i can do.my email address is firstname.lastname@example.org.And another thing,did you place a dot(.) as the codebase value in your applet attributes,because you wrote that you tried executing with the codebase =".".if you did,remove the dot(.) and
try running the html file again because the dot(.) is kinda telling the browser that the classfile is located somewhere and since it cant locate it,it throws such exception which you are currently getting.
Does it solve your problem?.if it didn't, mail your code to me using the stated email add.