music script not working please help! more details inside

[plutoniumman]

Hello all!
I'm making a game, and so far i'm only having trouble with the music.

<script>
<!--
// This is just the part of the code i'm having trouble with.
function music() {
document.write("<bgsound src='win2.mid' loop='-1'>")
}
function check() {
if (HP4 <= 0){
window.alert("You win!")
document.write("<bgsound src='win.mid' loop='1'>")
setTimeout('music()', 10000)
} else {
if (HP2 <= 0) {
window.alert("You Lose.")
document.write("<bgsound src='lose.mid' loop='1'>")
} else {
}
}
}
//-->
</script>

And it crashes after I win and after it plays win.mid.
Any help is appreciated.

[plutoniumman]

I forgot to mention that there is more code, but that shouldnt conflict with any of the code in my other post.