I only have access to 2 fields. The head and body section and I can only edit inside these tags not these actual tags. What I'm needing is to play a mp3 sound upon entering the site but I can only have it played once. Even if the back button is hit. So I was thinking cookie via JavaScript. Here's what I have but I'm just starting with JS and need some help.

<script language="javascript">
if (!getCookie('lastClip')) {document.write('<EMBED SRC="http://www.domain.com/mp3file.mp3" AUTOSTART="true" VOLUME="50" HEIGHT="60" WIDTH="144" HIDDEN="TRUE">')
setCookie('lastClip',true,3600000)
}
</script>

use the code below:

<script language="javascript">
function getCookie(name)
{
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while(i < clen)
{
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
{
return getCookieVal(j);
}
i = document.cookie.indexOf(" ", i) + 1;
if(i == 0) break;
}
return;
}
// store cookie value with optional details as needed
function setCookie(name, value, expires, path, domain, secure)
{
if(expires){var dt=new Date();dt.setTime(dt.getTime() + expires);}
document.cookie = name + "=" + escape(value) +
((expires) ? "; expires=" + dt.toGMTString() : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}
// remove the cookie by setting ancient expiration date
function deleteCookie(name,path,domain)
{
if(getCookie(name))
{
document.cookie = name + "=" +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}

if (!getCookie('lastClip')) {document.write('<EMBED SRC="http://www.domain.com/mp3file.mp3" AUTOSTART="true" VOLUME="50" HEIGHT="60" WIDTH="144" HIDDEN="TRUE">');
}
setCookie('lastClip',true,3600000);
</script>