i search online and got this script
Code:
<script language="JavaScript1.2">
scores = new Array(20);
var numTotal=0;
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;
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) {
	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") {
            whichEl1.style.display = "block";
        }
        else {
            whichEl1.style.display = "none";
        }
    }    else {
        whichEl = eval("document." + el + "Child");
		for(i=1;i<=numTotal;i++){
			whichEl = eval("document." + scores[i] + "Child");
			if(whichEl!=whichEl1) {
				whichEl.visibility = "hide";
			}
		}
        if (whichEl.visibility == "hide") {
            whichEl.visibility = "show"; 
       }        else {
            whichEl.visibility = "hide";
        }
        arrange();
    }}
onload = initIt;
</script>



<div id='KB1Parent' class='parent'><a href="default.htm" onClick="expandIt('KB1'); return false">
<IMG SRC='plus.gif' BORDER=0>MAIN</a></div><div id='KB1Child' class='parent'>
<a href='time1.htm' target='_target'> <IMG SRC='blank.gif' BORDER=0>home</a><br>
<a href='time2.htm' target='_target'> <IMG SRC='blank.gif' BORDER=0>contact</a><br>
</div>
When you click on the "MAIN", the menu will expand, you click again the menu will fold, however when i tried to link a page to "MAIN" the link does not work, how to do?