js控制网页背景音乐开关

<BGSOUND id=MusicBox balance=0 src="/web/rrhjz/2007115478536/images/rrhjz.mp3" volume=0><IMG id=img_bgsound style="CURSOR: hand" onclick=bgSoundClk(this) src="/syWebEditor/UploadFile/m1.gif" align=absBottom>
<SCRIPT language=javascript> 
function bgSoundClk(obj) 
{ 
var expires = new Date(); 
expires.setTime(expires.getTime() + 3 * 300 * 24 * 60 * 60 * 1000); 

    if(MusicBox.src=='') 
    { 
        MusicBox.src='/web/rrhjz/2007115478536/images/rrhjz.mp3'; 
        obj.src='/syWebEditor/UploadFile/m1.gif'; 
        setCookie("bgSound", "0", expires); 
    }else{ 
        MusicBox.src=''; 
        obj.src='/syWebEditor/UploadFile/m0.gif'; 
        setCookie("bgSound", "1", expires); 
    }     
} 
if(getCookie("bgSound") == "1") 
{ 
    MusicBox.src=''; 
    img_bgsound.src='/syWebEditor/UploadFile/m0.gif' 
}else{ 
    MusicBox.src='/web/rrhjz/2007115478536/images/rrhjz.mp3'; 
    img_bgsound.src='/syWebEditor/UploadFile/m1.gif'; 
} 
</SCRIPT>