Mls515, that's hard for most people. Most people see piles of code that doesn't make sense. I agree, that's how I would do it, but for a lot of people that is not a helpful reply.
B7474, this has been discussed in detail in previous threads. Search for them.
It is the same as with .wav or .mid, etc. You will also find http://www.funky-chickens.com
helpful if you want to learn HTML tricks. As for background sounds it should be really easy to find in a quick search of this forum. I know I have explained it step by step at least twice. If you can't find it let me know, I'll dig it up for you. Goodluck!