/*
a.title:visited{
	font-size:12px;text-decoration:none; color:#000000;
}
a.title:hover{
	font-size:12px;text-decoration:none; color:#A0A0A0;	
}
a.title:link{
	font-size:12px;text-decoration:none; color:#000000;
}
<!-- start -->
<div class=main id=main1 onclick=expandIt(1)>
	<table width="95%"  border="0" align="center" cellpadding="0" cellspacing="5" class="w1">
		<tr>
		  <td height="22" valign="middle">Main Menu</td>
		</tr>
	</table>
	<div class=sub id=sub1 style="display:none;" onClick="javascript:disSub(1);">
		<span class="dian">□　</span><a href="javascript:;" class="title" target="pro_core">Sub Menu</a><br>
	</div>
</div>	
<!-- end -->		
*/
document.writeln("<style type=\"text/css\">");
document.writeln("<!--");
document.writeln("/*body,div {  font:menu}*/");
document.writeln(".main {");
document.writeln("	cursor:hand;");
document.writeln("}");
document.writeln(".sub {");
document.writeln("	padding-left:1.2em;");
document.writeln("	line-height:140%;");
document.writeln("	cursor:hand;");
document.writeln("}");
document.writeln(".menu{");
document.writeln("	cursor:hand;");
document.writeln("}");
document.writeln("-->");
document.writeln("</style>");

var count=0;//做计数器
var limit=new Array();//用于记录当前显示的哪几个菜单
var countlimit=1;//同时打开菜单数目，可自定义
function expandIt(el) {
obj = eval("sub" + el);
	if (obj.style.display == "none") {
		obj.style.display = "block";//显示子菜单
		if (count<countlimit) {//限制1个
		limit[count]=el;//录入数组
		count++;
		}
		else {
		eval("sub" + limit[0]).style.display = "none";
		for (i=0;i<limit.length-1;i++) {limit[i]=limit[i+1];}//数组去掉头一位，后面的往前挪一位
		limit[limit.length-1]=el;
		}
	}
	else {
	obj.style.display = "none";
	var j;
	for (i=0;i<limit.length;i++) {if (limit[i]==el) j=i;}//获取当前点击的菜单在limit数组中的位置
	for (i=j;i<limit.length-1;i++) {limit[i]=limit[i+1];}//j以后的数组全部往前挪一位
	limit[limit.length-1]=null;//删除数组最后一位
	count--;
	}
}
function disSub(el){
	obj=eval("sub" + el);
	expandIt(el);
	return false;
	obj.style.display="block";
}