When this script was written, Yahoo allowed itself to be displayed in an iframe. It no longer does. Bing is a site that still allows display in iframe. Try changing this part:
Code:
<a href="#" onClick="yahoowin=dhtmlwindow.open('yahoo', 'iframe', 'http://yahoo.com', 'Yahoo', 'width=500px,height=300px,center=1'); return false">Show Yahoo</a>
to:
Code:
<a href="#" onClick="bingwin=dhtmlwindow.open('bing', 'iframe', 'http://bing.com', 'Bing', 'width=500px,height=300px,center=1'); return false">Show Bing</a>
There could also be other problems. But if the window popped up OK and was blank, this should fix it.
The browser cache may have to be emptied and/or the page refreshed to see changes.
Added later by another frequent contributor:

Originally Posted by
molendijk
Your web page takes too long to load so I can't test it. If the issue is that Yahoo doesn't show in an iframe then this is not a bug in the script. Yahoo simply doesn't allow their page to be shown in an iframe.
I had the same problem loading your page as Arie (molendijk) did. So we are both just guessing here, but I think we probably have it, unless you also have other issues.
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