5层树形结构，不知道问题出在那儿，请好心的大虾们一定一定要帮帮小虾米阿！！

Question

initIt函数未定义，程序不全，贴出全程序

Answer 1

expandIt3(el,p)没用定义
initIt没用定义

Answer 2

with (document) {
        write("<STYLE TYPE='text/css'>");
        write(".gen1 {display:none}");
        write(".gen2{display:none}");
        write(".gen3{display:none}");
        write(".gen4{display:none}");
        write(".gen5{display:none}");
        write("</STYLE>");
    }
 
 
 
function initIt(){
    
        divColl = document.all.tags("DIV");
        
        for (i=0; i<divColl.length; i++) {
            whichEl = divColl(i);
            if (whichEl.className == "gen1") whichEl.style.display = "none";
            if (whichEl.className == "gen2") whichEl.style.display = "none";
            if (whichEl.className == "gen3") whichEl.style.display = "none";
            if (whichEl.className == "gen4") whichEl.style.display = "none";
            if (whichEl.className == "gen5") whichEl.style.display = "none";
           
        }
    
}

Answer 3

function expandIt3(el,p) {
        p=0;
        while(!(eval(el+"gen3"+p)))
        {
         whichE3[p]=eval(el+"gen3"+p);
         whichIm = event.srcElement;
         if (whichE3[p].style.display == "none") {
          whichE3[p].style.display = "block";
          
          m=0;
          while(!(eval(el+"gen4"+m)))
          {
           whichE4[m]=eval(el+"gen4"+m);
           whichE4[m].style.display="none";
           m++;
          }
           n=0;
          while(!(eval(el+"gen5"+n)))
          {
           whichE5[n]=eval(el+"gen5"+n);
           n++;
          }
         whichIm.src = "image/expand.gif";
        }
        else {
         whichE3[p].style.display = "none";
          
          m=0;
          while(!(eval(el+"gen4"+m)))
          {
           whichE4[m]=eval(el+"gen4"+m);
           whichE4[m].style.display="none";
           m++;
          }
           n=0;
          while(!(eval(el+"gen5"+n)))
          {
           whichE5[n]=eval(el+"gen5"+n);
           n++;
          }
         whichIm.src = "image/collapse.gif";
        }
         p++;
        }
        
   }
       
 function expandIt4(el,p) {
        p=0;
        while(!(eval(el+"gen1"+p)))
        {
         whichE4[p]=eval(el+"gen4"+p);
         whichIm = event.srcElement;
         if (whichE4[p].style.display == "none") {
          whichE4[p].style.display = "block";
          
           n=0;
          while(!(eval(el+"gen5"+n)))
          {
           whichE5[n]=eval(el+"gen5"+n);
           n++;
          }
         whichIm.src = "image/expand.gif";
        }
        else {
         whichE4[p].style.display = "none";
          
           n=0;
          while(!(eval(el+"gen5"+n)))
          {
           whichE5[n]=eval(el+"gen5"+n);
           n++;
          }
         whichIm.src = "image/collapse.gif";
        }
         p++;
        }
        
   }