Create an image library, with thumbnail views for the Web.
For the view to work, you must create a form with a rich text field to hold your thumbnail image. The code that follows can go either into a column in your view for the Web or, more efficiently, into a hidden field on your form.
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It will pull the thumbnail image from your form and make it a clickable link in the view, assuming your thumbnail Rich Text Field is called 'Thumbnail'.
"[<a href = /database.nsf/webview/"+@Text(@DocumentUniqueID) +"?OpenDocument><img src=/database.nsf/webview/"+@Text (@DocumentUniqueID)+"/Thumbnail/0.70?OpenElement&FieldElemFormat=gif border = 0></a>]"