If you're using Firefox and this is happening: Update/upgrade to a newer version. That fixed that problem for me. If you're not using Firefox, perhaps you should be. Secondly: if you're using Firefox, install the Adblock Plus
plugin. Anything that's still an annoyance can then easily be blocked. If you're not using Firefox, well...
What I did, until I upgraded Firefox and added Adblock Plus, was turn off Flash (Tools -> Add-ons -> Plugins -> Shockwave Flash: Disable) so I could get to the menu, and cloned the URL for the desired entry into my bookmarks.
Or you can just leave Shockwave Flash disabled. It's a security risk, anyway.
As for appealing to the owners of Sailnet to employ a bit of moderation in their use of adverts: I think that ship's sailed.
Edit to add: I just looked: I have eleven (11) entries in ABP: All
of them from this one site.