var arrLi= document.getElementById(“ul”).getElementsByTagName(“li”);
var arrDiv=document.getElementsByClassName(“box”)[0].getElementsByTagName(“div”);
for(var i=0;i<arrLi.length;i=i+1){
arrLi[i].index=i
arrLi[i].onmouseover=function () {
for(var j=0;j<arrLi.length;j=j+1){
arrLi[j].className=""
arrDiv[j].className=""
}
this.className=“actLi”
arrDiv[this.index].className=“act”
}
}