Progress bar & textcolor - wrong position

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   I implemented some Ads (e.g. Amazons selfoptimising links) on my board. I use Javascript. When I use the back button either the progress bar (Progressing...) or the textcolors apears instead of the Ad.
E.g.:
The progress bar comes up instead of the Ad when I search the forum and
click the back button. (Also if the Ads are placed in the header)
It seams as only Firefox has the problem.

Any ideas how I can prevent this?

thx.

Example: