I think the subject speaks for itself, but I'll ask anyway.

How do I implement PDF viewing on the clientside?

 Thanks

That depends entirely on your definition of "PDF viewing on the clientside".  One could argue that merely downloading the PDF, and viewing it in Adobe Acrobat or Foxit Reader would be client side viewing. :)

If you mean by using the WebThumbnailViewer and WebImageViewer, then you will need to use our DotImage add on, PDF Rasterizer Module: http://www.atalasoft.com/products/dotimage/pdfrasterizer/

Once you register the decoder, you will be able to load PDF's into the WebThumbnailViewer and subsequently load each page in the WebImageViewer.  Here is a kb article that explains how to register the decoder: http://www.atalasoft.com/KB/article.aspx?id=10175