Toshiba HDTV + SONY PLAYSTATION 3 + SONY Home Theatre DAVHDX265
I have looked up the infomation on your TV I noticed that your TV has two HDMI input plugs. Since your SONY BRAVIA is hooked up to one port, you need to buy another HDMI cable for your PS3. On your tv remote you should have an option to switch from video 1 to video 2 so then you can switch from the SONY BRAVIA to the PS3 the problem is you will only hear your PS3 Sound from you TV. If you want to hear your PS3 sound from your SONY BRAVIA you need to buy an optical cable (also called TOSLINK) to connect from your PS3 to the SONY BRAVIA.
Hope that helps!