Safari cannot detect link

I have been sent a link to a document formatted as a pdf-file. When it steer the mouse-pointer over the link, nothing happens. When I steer the mouse-pointer a little below the link, the pointing-hand image flickers on and off at such speed that it cannot be used.

The website-manager insists that he can get the link to work, using Safari with plug-ins enabled. I cannot.

I have looked at MacintoshHD/Libarary/Internet plug-ins, and can see nothing there that mentions pdf. What I see is as follows:

file://localhost/Library/Internet%20Plug-Ins/DivXBrowserPlugin.plugin/

file://localhost/Library/Internet%20Plug-Ins/ebldetect.bundle/

file://localhost/Library/Internet%20Plug-Ins/Flash%20Player.plugin/

file://localhost/Library/Internet%20Plug-Ins/flashplayer.xpt

file://localhost/Library/Internet%20Plug-Ins/Flip4Mac%20WMV%20Plugin.plugin/

file://localhost/Library/Internet%20Plug-Ins/Flip4Mac%20WMV%20Plugin.webplugin/

file://localhost/Library/Internet%20Plug-Ins/iPhotoPhotocast.plugin/

file://localhost/Library/Internet%20Plug-Ins/JavaAppletPlugin.plugin/

file://localhost/Library/Internet%20Plug-Ins/npdivx.xpt

file://localhost/Library/Internet%20Plug-Ins/nsIQTScriptablePlugin.xpt

file://localhost/Library/Internet%20Plug-Ins/Quartz%20Composer.webplugin/

file://localhost/Library/Internet%20Plug-Ins/QuickTime%20Plugin.plugin/

file://localhost/Library/Internet%20Plug-Ins/Silverlight.plugin/

Can any kind person help ?