只要我的鼠标出现在右边，但还没有放到菜单上面，就弹出子菜单
下面这个菜单的Item1和Item2原来是横着排放的，我把它修改为竖着排放后，出现了奇怪现象，只要我的鼠标出现在右边，但还没有放到菜单上面，就弹出子菜单，请问是什么原因，如何解决？
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javaScriptDropDownMenu</title>
<style type="text/CSS">
* {
padding:0;
margin:0;
}
body {
font-family:verdana, sans-serif;
font-size:small;
}
#navigation, #navigation li ul {
list-style-type:none;
}
#navigation {
margin:20px;
}
#navigation li {
text-align:center;
position:relative;
}
#navigation li a:link, #navigation li a:visited {
display:block;
text-decoration:none;
color:#000;
width:120px;
height:40px;
line-height:40px;
border:1px solid #fff;
border-width:1px 1px 0 0;
background:#c5dbf2;
padding-left:10px;
}
#navigation li a:hover {
color:#fff;
background:#2687eb;
}
#navigation li ul li a:hover {
color:#fff;
background:#6b839c;
}
#navigation li ul {
display:none;
position:absolute;
top:40px;
left:0;
margin-top:1px;
width:120px;
}
#navigation li ul li ul {
display:none;
position:absolute;
top:0px;
left:130px;
margin-top:0;
margin-left:1px;
width:120px;
}
</style>
<script type="text/Javascript">
function displaySubMenu(li) {
var subMenu = li.getElementsByTagName("ul")[0];
subMenu.style.display = "block";
}
function hideSubMenu(li) {
var subMenu = li.getElementsByTagName("ul")[0];
subMenu.style.display = "none";
}
</script>
</head>
<body>
<ul id="navigation">
<li onmouSEOver="displaySubMenu(this)" onmouseout="hideSubMenu(this)">
<a href="#">Item1</a>
<ul>
<li><a href="#">Item1->Menu1</a></li>
<li><a href="#">Item1->Menu2</a></li>
<li><a href="#">Item1->Menu3</a></li>
<li><a href="#">Item1->Menu4</a></li>
</ul>
</li>
<li id="tb0" onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)">
<a href="#">Item2</a>
<ul>
<li><a href="#">Item2->Menu1</a></li>
<li><a href="#">Item2->Menu2</a></li>
<li><a href="#">Item2->Menu3</a></li>
<li><a href="#">Item2->Menu4</a></li>
<li><a href="#">Item2->Menu5</a></li>
</ul>
</li>
[解决办法]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>javaScriptDropDownMenu</title> <style type="text/CSS"> * { padding:0; margin:0; } body { font-family:verdana, sans-serif; font-size:small; } #navigation, #navigation li ul { list-style-type:none; } #navigation { margin:20px; } #navigation li { text-align:center; position:relative; } #navigation li a:link, #navigation li a:visited { display:block; text-decoration:none; color:#000; width:120px; height:40px; line-height:40px; border:1px solid #fff; border-width:1px 1px 0 0; background:#c5dbf2; padding-left:10px; } #navigation li a:hover { color:#fff; background:#2687eb; } #navigation li ul li a:hover { color:#fff; background:#6b839c; } #navigation li ul { display:none; position:absolute; /* top:40px; left:0; margin-top:1px; 你既然已经把菜单竖起来了，原来的这些横着的 样式设置就不知道改改吗？ 所以，上面我才让你看书去... */ /* 下面是竖着的样式 */ top:0px; left:130px; margin-left:1px; /*而且我还告诉你，烦事还多着呢，最头痛的是各浏览器的兼容， 还要对CSS进行改造,hack。不懂CSS怎么搞？呵呵 */ width:120px; } #navigation li ul li ul { display:none; position:absolute; top:0px; left:130px; margin-top:0; margin-left:1px; width:120px; } </style> <script type="text/Javascript"> function displaySubMenu(li) { var subMenu = li.getElementsByTagName("ul")[0]; subMenu.style.display = "block"; } function hideSubMenu(li) { var subMenu = li.getElementsByTagName("ul")[0]; subMenu.style.display = "none"; } </script></head><body> <ul id="navigation"> <li onmouSEOver="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> <a href="#">Item1</a> <ul> <li><a href="#">Item1->Menu1</a></li> <li><a href="#">Item1->Menu2</a></li> <li><a href="#">Item1->Menu3</a></li> <li><a href="#">Item1->Menu4</a></li> </ul> </li> <li id="tb0" onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> <a href="#">Item2</a> <ul> <li><a href="#">Item2->Menu1</a></li> <li><a href="#">Item2->Menu2</a></li> <li><a href="#">Item2->Menu3</a></li> <li><a href="#">Item2->Menu4</a></li> <li><a href="#">Item2->Menu5</a></li> </ul> </li> </ul></body></html>