Add to Head

<script LANGUAGE="JavaScript"><!--
// Preload and play audio files with event handler (MouseOver sound)
// designed by JavaScript Archive, (c)1999
// Get more free javascripts at http://jsarchive.8m.com

var aySound = new Array();
// Below: source for sound files to be preloaded
aySound[0] = "laser.wav";

// DO NOT edit below this line
document.write('<BGSOUND ID="auIEContainer">')
IE = (navigator.appVersion.indexOf("MSIE")!=-1 && document.all)? 1:0;
NS = (navigator.appName=="Netscape" && navigator.plugins["LiveAudio"])? 1:0;
ver4 = IE||NS? 1:0;
onload=auPreload;

function auPreload() {
if (!ver4) return;
if (NS) auEmb = new Layer(0,window);
else {
Str = "<DIV ID='auEmb' STYLE='position:absolute;'></DIV>";
document.body.insertAdjacentHTML("BeforeEnd",Str);
}
var Str = '';
for (i=0;i<aySound.length;i++)
Str += "<EMBED SRC='"+aySound[i]+"' AUTOSTART='FALSE' HIDDEN='TRUE'>"
if (IE) auEmb.innerHTML = Str;
else {
auEmb.document.open();
auEmb.document.write(Str);
auEmb.document.close();
}
auCon = IE? document.all.auIEContainer:auEmb;
auCon.control = auCtrl;
}
function auCtrl(whSound,play) {
if (IE) this.src = play? aySound[whSound]:'';
else eval("this.document.embeds[whSound]." + (play? "play()":"stop()"))
}
function playSound(whSound) { if (window.auCon) auCon.control(whSound,true); }
function stopSound(whSound) { if (window.auCon) auCon.control(whSound,false); }
//-->
</script>

-------------------------------------------------------------------------------

Step 2: Edit the aySound array to preload the sound files.

aySound[0]="YourSoundFile.wav";
aySound[1]="AnotherSoundFile.wav";
aySound[2]="EvenAnotherOne.wav";
.
.
as many sound files as one wants. 

--------------------------------------------------------------------------------------

Step 3: Finally, play the sound files with an event handler.
With a link:

- onMouseOver/onMouseOut sound: 
   <A HREF="YourPage.html" onMouseOver="playSound(0)" onMouseOut="stopSound(0)">Move mouse over to play sound</A> 

- onClick sound: 
   <A HREF="javascript:playSound(0);">Click here to play sound</A> 

-With a button:
-  |=|=|
   <INPUT TYPE="BUTTON" VALUE="Click me!" onClick="playSound(0)">