不会啊！
<html>
<head>
<script>
function headScript()
{alert(document.eyun.test.value);
}
</script>
</head>
<body>
<script>
function bodyScript()
{alert(document.eyun.test.value);
}
</script>
<form name="eyun">
<input name="test" value="test" />
</form>
<button onclick="bodyScript()">Body</button> <button onclick="headScript()">Head</button>
</body>
</html>
<html>
<head>
<script>
function headScript()
{alert(document.eyun.test.value);
}
</script>
</head>
<body>
<script>
function bodyScript()
{alert(document.eyun.test.value);
}
</script>
<form name="eyun">
<input name="test" value="test" />
</form>
<button onclick="bodyScript()">Body</button> <button onclick="headScript()">Head</button>
</body>
</html>
<head>
<title>图像效果演示</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script>
/*
舜子制作
Made by PuterJam
*/
//--初始化变量--
var rT=true;//允许图像过渡
var bT=true;//允许图像淡入淡出
var tw=150;//提示框宽度
var endaction=false;//结束动画var ns4 = document.layers;
var ns6 = document.getElementById && !document.all;
var ie4 = document.all;
offsetX = 0;
offsetY = 20;
var toolTipSTYLE="";
function initToolTips()
{
if(ns4||ns6||ie4)
{
if(ns4) toolTipSTYLE = document.toolTipLayer;
else if(ns6) toolTipSTYLE = document.getElementById("toolTipLayer").style;
else if(ie4) toolTipSTYLE = document.all.toolTipLayer.style;
if(ns4) document.captureEvents(Event.MOUSEMOVE);
else
{
toolTipSTYLE.visibility = "visible";
toolTipSTYLE.display = "none";
}
document.onmousemove = moveToMouseLoc;
}
}
function toolTip(msg, fg, bg)
{
if(toolTip.arguments.length < 1) // hide
{
if(ns4)
{
toolTipSTYLE.visibility = "hidden";
}
else
{
//--图象过渡，淡出处理--
if (!endaction) {toolTipSTYLE.display = "none";}
if (rT) document.all("msg1").filters[1].Apply();
if (bT) document.all("msg1").filters[2].Apply();
document.all("msg1").filters[0].opacity=0;
if (rT) document.all("msg1").filters[1].Play();
if (bT) document.all("msg1").filters[2].Play();
if (rT){
if (document.all("msg1").filters[1].status==1 || document.all("msg1").filters[1].status==0){
toolTipSTYLE.display = "none";}
}
if (bT){
if (document.all("msg1").filters[2].status==1 || document.all("msg1").filters[2].status==0){
toolTipSTYLE.display = "none";}
}
if (!rT && !bT) toolTipSTYLE.display = "none";
//----------------------
}
}
else // show
{
if(!fg) fg = "#777777";
if(!bg) bg = "#eeeeee";
var content =
'<table id="msg1" name="msg1" border="0" cellspacing="0" cellpadding="1" bgcolor="' + fg + '" class="trans_msg"><td>' +
'<table border="0" cellspacing="0" cellpadding="3" bgcolor="' + bg +
'"><td width=' + tw + '><font face="Arial" color="' + fg +
'" size="-2">' + msg +
' \;</font></td></table></td></table>'; if(ns4)
{
toolTipSTYLE.document.write(content);
toolTipSTYLE.document.close();
toolTipSTYLE.visibility = "visible";
}
if(ns6)
{
document.getElementById("toolTipLayer").innerHTML = content;
toolTipSTYLE.display='block'
}
if(ie4)
{
document.all("toolTipLayer").innerHTML=content;
toolTipSTYLE.display='block'
//--图象过渡，淡入处理--
var cssopaction=document.all("msg1").filters[0].opacity
document.all("msg1").filters[0].opacity=0;
if (rT) document.all("msg1").filters[1].Apply();
if (bT) document.all("msg1").filters[2].Apply();
document.all("msg1").filters[0].opacity=cssopaction;
if (rT) document.all("msg1").filters[1].Play();
if (bT) document.all("msg1").filters[2].Play();
//----------------------
}
}
}
function moveToMouseLoc(e)
{
if(ns4||ns6)
{
x = e.pageX;
y = e.pageY;
}
else
{
x = event.x + document.body.scrollLeft;
y = event.y + document.body.scrollTop;
}
toolTipSTYLE.left = x + offsetX;
toolTipSTYLE.top = y + offsetY;
return true;
}</script>
<style type="text/css">
<!--
.trans_msg
{
filter:alpha(opacity=100,enabled=1) revealTrans(duration=.2,transition=1) blendtrans(duration=.2);
}
-->
</style>
</head>
<script>
</script>
<body>
<div id="toolTipLayer" style="position:absolute; visibility: hidden"></div>
<script>initToolTips()</script>
<font face="Arial">
<a href="#" onMouseOver="toolTip('这是个好东东<br>你说呢<br>哈哈')" onMouseOut="toolTip()">test</a></font>
<font face="Arial">
<a href="#" onMouseOver="toolTip('你要吗，好好用的哦真的', '#FFFF00', 'red')" onMouseOut="toolTip()">test</a></font>
<font face="Arial">
<a href="#" onMouseOver="toolTip('这是个好东东<br>你说呢<br>哈哈', '#FFFF00', 'orange')" onMouseOut="toolTip()">test</a></font>
<font face="Arial">
<a href="#" onMouseOver="toolTip('<marquee>跑啊!!跑</marquee>', '#FFFF00', 'orange')" onMouseOut="toolTip()">test</a></font>
</body>
document.all：IE4+ ，所有可用元素的集合
formname直接使用：IE如果不是仅限于对IE，那么用document.formname
document.getElementById：IE5+，NN6+
<script defer>或者像上面的使用函数
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/dhtml_reference_entry.asp