PS3's menu pops up during playback

[CptGreedle]

Do you have the PS3 Blu-ray remote? I use that all the time, definitely worth it. You should also update your firmware first. I use a, Apple Airport Extreme (and an express to extend the signal) and it works marvelously. If you don't want to go apple, there are lots of wireless routers out there that are fairly cheap that your PS3 will be able to use. I recommend this cause you should never move your cable modem to get something online. It is easy to add wireless to an existing wired system, and it gives you great flexibility.
All my consoles use wireless and it's protected. My Wii, my PS3, my 2 laptops, etc all use the wireless part but I still have 2 pcs connected via wired LAN.
It's worth the price to get a wireless router.