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Where is the code?

If you are generating the iframe on the fly on IE8, there is one special gotcha for this particular browser. You need to specify the name attribute inside your document.createElement method call:

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Does this show the content to everybody, or only to you on the one session?

If you really want to learn Java Programming, you can get help from free online tutoring websites like Code.org, TutorIndia, khanacademy and so on.