This page contains both secure and nonsecure items

A solution to avoiding the warning:

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When you receive the error message, click Yes.
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In Internet Explorer, go to Tools, Internet Options, click the Security tab; make sure that in „Select a zone…” window that Internet is selected.
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Click Custom Level and scroll down about half way to „Display mixed content” in the Miscellaneous section.
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Change it from Prompt to Enable.
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Click OK, Yes, and OK. The change should take effect immediately.