cookie fir javascript music

Hay,
I have a javascript code to play a sound in my website.But when I click on a link in the site and the page comes on , the sound stop. I need a cookie or differnt javascript code to play the sound all the times, that the visitor is browsing in the site ,whit option on/off :
That`s my code
<script language="JavaScript"><!--
function musicOff() {
document.midi.stop()
}function musicOn() {
document.midi.play()
}


function changeButton() {
if (document.onoff.B1.value=='Turn off') {
document.onoff.B1.value='Turn on';
musicOff()
}
else {
document.onoff.B1.value='Turn off';
musicOn()
}
}
//-->
</script>

<form name="onoff">
Sound:
<input type="button" value="Turn off" name="B1" onClick="changeButton()" style="background-color:#356ca5;" class="c" OnMouseOver="this.className='d';" OnMouseOut="this.className='c';" border="0">
</form>
<embed name="midi" src="./css/1.wav" width="0" height="0" loop=1 hidden>