I tried the approach suggested by Ruud but got stuck with the css for the flag
Apart from the problem the menu is getting too wide when adding two flags.. This should position the flags ok.
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Put the code instead of the current <img> tag.
There are many more issues with this page/template.
Have a source-view look (using firefox) at your template and try to fix all "red" lines (errors). Only then you can trust css styling!