Problems with a onclick="MM_openBrWindow

Hi, I’ve been running a couple of voluntary sites for a while now, however I have noticed that with Microsoft Edge the onclick="MM_openBrWindow is all over the place whereas it’s fine on Chrome and Firefox.

Any thoughts? Although I’ve been doing this for some time my grasp of Java is at best novice. Many thanks.

Here is one of the pages

http://www.wildlives.org.uk/news_letters-4/2017/November/news-letter.htm

Many thanks

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