求助!!!WEB页面上的树型菜单问题!

Question

whichEl.pageY = nextY;            nextY += whichEl.document.height;        }    }}function initIt(){    if (!ver4) return;    if (NS4) {        for (i=0; i<document.layers.length; i++) {            whichEl = document.layers[i];            if (whichEl.id.indexOf("Child") != -1) whichEl.visibility = "hide";       }        arrange();    }    else {        divColl = document.all.tags("DIV");        for (i=0; i<divColl.length; i++) {            whichEl = divColl(i);            if (whichEl.className == "child") whichEl.style.display = "none";        }    }}function expandIt(el) { if (!ver4) return;    if (IE4) {        whichEl1 = eval(el + "Child"); for(i=1;i<=numTotal;i++){ whichEl = eval(scores[i] + "Child"); if(whichEl!=whichEl1) { whichEl.style.display = "none"; } }        whichEl1 = eval(el + "Child");        if (whichEl1.style.display == "none") {