高分求教

代码如下：
<HTML>
<HEAD>
<LINK href="../image/style.css" rel=stylesheet>
<base target="right1">
</HEAD>
<BODY style="TEXT-ALIGN: center" leftMargin=0 topMargin=4 >
<TABLE width="110%" background="../image/rightbg.gif" >
  <TBODY> 
  <TR>
                      <TD width="100%" 
                      >
                        <SCRIPT language=JavaScript>
<!--
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;img_minus="../../image/F-midplus1.gif";
img_plus="../../image/F-midplus.gif";expd_KB1 = 1;
expd_KB2 = 1;
expd_KB3 = 1;
expd_KB4 = 1;
expd_KB5 = 1;if (ver4) {
    with (document) {
        write("<STYLE TYPE='text/css'>");
        if (NS4) {
            write(".parent {position:absolute; visibility:visible}");
            write(".child {position:absolute; visibility:visible}");
            write(".regular {position:absolute; visibility:visible}")
        }
        else {
            write(".child {display:none}")
        }
        write("</STYLE>");
    }
}function getIndex(el) {
    ind = null;
    for (i=0; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.id == el) {
            ind = i;
            break;
        }
    }
    return ind;
}function arrange() {
    nextY = document.layers[firstInd].pageY +document.layers[firstInd].document.height;
    for (i=firstInd+1; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.visibility != "hide") {
            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, id) {
    if (!ver4) return;
    if (IE4) {
        whichEl = eval(el + "Child");
        if (whichEl.style.display == "none") {
            whichEl.style.display = "block";
        }
        else {
            whichEl.style.display = "none";
        }
    }
    else {
        whichEl = eval("document." + el + "Child");
        if (whichEl.visibility == "hide") {
            whichEl.visibility = "show";
        }
        else {
            whichEl.visibility = "hide";
        }
        arrange();
    } if (id == 1)
{
    if (expd_KB1==1) {img_KB1.src=img_minus;expd_KB1=2;}
    else {img_KB1.src=img_plus;expd_KB1=1;}
    }
    else if (id == 2)
    {
    if (expd_KB2 == 1) {img_KB2.src=img_minus;expd_KB2 = 2;}
    else {img_KB2.src=img_plus;expd_KB2 = 1;}
    }
    else if (id == 3)
    {
    if (expd_KB3 == 1) {img_KB3.src=img_minus;expd_KB3 = 2;}
    else {img_KB3.src=img_plus;expd_KB3 = 1;}
    }
    else if (id == 4)
    {
    if (expd_KB4 == 1) {img_KB4.src=img_minus;expd_KB4 = 2;}
    else {img_KB4.src=img_plus;expd_KB4 = 1;}
    }
    else if (id == 5)
    {
    if (expd_KB5 == 1) {img_KB5.src=img_minus;expd_KB5 = 2;}
    else {img_KB5.src=img_plus;expd_KB5 = 1;}
    }
    
}onload = initIt;
function theright(rurl, onlyone) {
var mrstr = String(Math.random()); if (onlyone == true)
parent.f2.window.location.href = rurl + "?GRSN=" + mrstr.substring(2, 10);
else
parent.f2.window.location.href = rurl + "&GRSN=" + mrstr.substring(2, 10);
}
//-->
</SCRIPT>                        
                       
                       <IMG 
                        height=20 src="../image/F-midblk.gif" 
                        align=absMiddle border=0><IMG height=16 
                        src="../image/F-Good.gif" width=16 
                        align=absMiddle border=0> <A 
                        href="../bmsw/rlb/swbmduo.aspx?bs=bmyzj">ddddddddd</A><BR>
                       
                     
                        <DIV class=parent id=KB3Parent><A 
                        onclick="expandIt('KB3', 3); return false" 
                        href="http://ysots.zgqr.com/Student/default.asp#"><IMG 
                        height=20 src="../image/F-midplus.gif" 
                        align=absMiddle border=0 name=img_KB3></A><IMG height=16 
                        src="../image/F-Bag.gif" width=16 
                        align=absMiddle border=0><font color="#3333FF">第一层</font><BR></DIV>
                        <DIV class=child id=KB3Child><IMG height=20 
                        src="../image/F-line.gif" align=absMiddle 
                        border=0><IMG height=20 
                        src="../image/F-midblk.gif" 
                        align=absMiddle border=0><IMG height=16 
                        src="../image/F-talk.gif" width=16 
                        align=absMiddle border=0><A 
                        href="../bmsw/rlyx/yxry.aspx">第一层(点击最左边展开第二层）</A><BR><IMG 
                        height=20 src="../image/F-line.gif" 
                        align=absMiddle border=0><IMG height=20 
                        src="../image/F-midblk.gif" 
                        align=absMiddle border=0><IMG height=16 
                        src="../image/F-I2.gif" width=16 
                        align=absMiddle border=0>  <A 
                        href="../bmsw/rlyx/swyxduo.aspx?bs=yxzjh">第二层</A><BR><IMG 
                        height=20 src="../image/F-line.gif" 
                        align=absMiddle border=0><IMG height=20 
                        src="../image/F-midblk.gif" 
                        align=absMiddle border=0><IMG height=16 
                        src="../image/F-I3.gif" width=16 
                        align=absMiddle border=0><A 
                        href="../bmsw/rlyx/swyxduo.aspx?bs=yxzzj">第二层</A><BR><IMG 
                        height=20 src="../image/F-line.gif" 
                        align=absMiddle border=0><IMG height=20 
                        src="../image/F-midblk.gif" 
                        align=absMiddle border=0><IMG height=16 
                        src="../image/F-text.gif" width=16 
                        align=absMiddle border=0> <A 
                        href="../bmsw/rlyx/swyxduo.aspx?bs=yxyjh">第二层</A><BR><IMG 
                        height=20 src="../image/F-line.gif" 
                        align=absMiddle border=0><IMG height=20 
                        src="../image/F-lastblk.gif" 
                        align=absMiddle border=0><IMG height=15 
                        src="../image/F-Good.gif" width=16 
                        align=absMiddle border=0> <A 
                        href="../bmsw/rlyx/swyxduo.aspx?bs=yxyzj">第二层</A><BR></DIV>
                        </A><BR></TD></TR></TBODY></TABLE>
               
             </BODY></HTML>