The link makes use of Javascript: 

<a href="#" onclick="javascript: ouverturePopup('Status/DownloadFile.A
+SP?CASNUM=50000&StatusCode=SIARC&DataNo=1'); return false;">50000.pdf
+</a>

[download]

In other words, you should be able to retrieve this particular PDF via the URL: 

http://cs3-hq.oecd.org/scripts/hpv/Status/DownloadFile.ASP?CASNUM=5000
+0&StatusCode=SIARC&DataNo=1

[download]

As this doesn't look too complicated to extract, you might get around having to execute the Javascript in this case...

In reply to Re: Mechnize, Links and Downloads by almut
in thread Mechnize, Links and Downloads by Anonymous Monk

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