jquery导航式弹出菜单问题,熟悉animate进
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script src="jquery-1.7.js" type="text/javascript">
</script>
<style type="text/css">
<!--
.STYLE1 {color: #FFFFFF}
#Layer1 {
	position:absolute;
	width:100px;
	height:215px;
	z-index:1;
	background-color: #009900;
}
-->
</style>
<script type="text/javascript">
  $(document).ready(function()
   {
      $("#tb1").hide();
	 $("#Layer1").height("0px");
	 $("#td1").mouseover(function()
	 {
	   $("tb1").show(300);
	   $("#Layer1").animate({height:"215px"},300);
	 });
	 $("#td1").mouseout(function()
	 {
	   $("tb1").hide(300);
	   $("#Layer1").animate({height:"0px"},300);
	 });
   });
</script>
</head>
<body>
<table width="702" border="0" cellpadding="0" cellspacing="0" bgcolor="#006699">
   <tr>
     <td><table width="700" border="0" cellspacing="0" cellpadding="0">
       <tr>
         <td width="100" height="30" id="td1"><div align="center" class="STYLE1">要闻</div></td>
         <td width="100"> </td>
         <td width="100"> </td>
         <td width="100"> </td>
         <td width="100"> </td>
         <td width="100"> </td>
         <td> </td>
       </tr>
       <tr>
         <td><div id="Layer1">
           <table width="100%" border="0" cellspacing="0" cellpadding="0" id="tb1">
             <tr>
               <td>项目0</td>
             </tr>
             <tr>
               <td><div align="center">项目1</div></td>
             </tr>
             <tr>
               <td><div align="center">项目2</div></td>
             </tr>
             <tr>
               <td><div align="center">项目3</div></td>
             </tr>
             <tr>
               <td><div align="center">项目4</div></td>
             </tr>
             <tr>
               <td><div align="center">项目5</div></td>
             </tr>
             <tr>
               <td><div align="center">项目6</div></td>
             </tr>
			            <tr>
               <td><div align="center">项目7</div></td>
             </tr>
						            <tr>
               <td><div align="center">项目8</d