The library you try to use is YUI from Yahoo.
Check for lines like:
<script src="http://yui.yahooapis.com/2.8.1/build/yahoo/yahoo-min.js"></script>
<script src="http://yui.yahooapis.com/2.8.1/build/dom/dom-min.js"></script>
If you do not find anything similar, add these two to your <head> tag. If you find them, correct the URL.
I just read your first post again and it seems that the page in error is not yours. As you looked at the source already, check if you see the reference to yahoo-min.js in their <head> tag. If you find it, copy the URL and try to open it in your browser. If you get a text file with code displayed, the reference is correct and you have disabled javascript in your browser. if the file does not display, the URL is incorrect or cannot be reached for some reason.
Juergen
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