这段代码在火狐下不起作用怎么办？谁能帮帮我！！

Question

var currslid = 0;
var slidint;
function setfoc(id){
document.getElementById("focpic").src = picarry[id];
document.getElementById("foclnk").href = lnkarry[id];
document.getElementById("fttltxt").innerHTML = "<a href=\""+lnkarry[id]+"\" target=_blank>"+ttlarry[id]+"</a>";
currslid = id;
for(i=0;i<11;i++)
{document.getElementById("tmb"+i).className = "thubpic";
};
document.getElementById("tmb"+id).className ="thubpiccur";
focpic.style.visibility = "hidden";
focpic.filters[0].Apply();
if (focpic.style.visibility == "visible") {
focpic.style.visibility = "hidden";
focpic.filters.revealTrans.transition=12;
}
else {
focpic.style.visibility = "visible";focpic.filters[0].transition=12;
}
focpic.filters[0].Play();
}
function playnext(){
if(currslid==10){
currslid = 0;
}else{
currslid++;
};
setfoc(currslid);
};
function playit(){
//slidint = setInterval(playnext,3500);
};
function stopit(){
clearInterval(slidint);
};

Answer 1

function setfoc(id) {
        var isIE = !!document.all, focpic = document.getElementById("focpic");/////////        focpic.src = picarry[id];
        document.getElementById("foclnk").href = lnkarry[id];
        document.getElementById("fttltxt").innerHTML = "<a href=\"" + lnkarry[id] + "\" target=_blank>" + ttlarry[id] + "</a>";
        currslid = id;
        for (i = 0; i < 11; i++) {
            document.getElementById("tmb" + i).className = "thubpic";
        };
        document.getElementById("tmb" + id).className = "thubpiccur";
        focpic.style.visibility = "hidden";       if(isIE) focpic.filters[0].Apply();///////////
        if (focpic.style.visibility == "visible") {
            focpic.style.visibility = "hidden";
            if (isIE) focpic.filters.revealTrans.transition = 12;///////////
        }
        else {
            focpic.style.visibility = "visible";
            if (isIE) focpic.filters[0].transition = 12;///////////
        }
        if (isIE) focpic.filters[0].Play();/////////
    }

Answer 2

ff不支持代理里面的滤镜，所以要加判断是ie就加滤镜效果，不是就直接隐藏，不执行滤镜代码