document.all[]是文档中所有标签组成的一个数组变量，包括了文档对象中所有元素；
event.button的值：0没按键 1按左键 2按右键 3按左和右键 4按中间键 5按左和中间键 6按右和中间键 7按所有的键
下面是实现代码，模仿window，并且让它可以盖住select
<!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>
<title>测试可动p</title>
<script language='javascript' type='text/javascript'>
var offset_x;
var offset_y;
function Milan_StartMove(oEvent,p_id)
{
var whichButton;
if(document.all&&oEvent.button==1) whichButton=true;
else { if(oEvent.button==0)whichButton=true;}
if(whichButton)
{
var op=p_id;
offset_x=parseInt(oEvent.clientX-op.offsetLeft);
offset_y=parseInt(oEvent.clientY-op.offsetTop);
document.documentElement.onmousemove=function(mEvent)
{
var eEvent;
if(document.all) eEvent=event;
else{eEvent=mEvent;}
var op=p_id;
var x=eEvent.clientX-offset_x;
var y=eEvent.clientY-offset_y;
op.style.left=(x)+"px";
op.style.top=(y)+"px";
var d_op=document.getElementById("disable_"+op.id);
d_op.style.left=(x)+"px";
d_op.style.top=(y)+"px";
}
}
}
function Milan_StopMove(oEvent){document.documentElement.onmousemove=null; }
function p_Close(o)
{var op=o; op.style.display="none";var d_op=document.getElementById("disable_"+o.id);d_op.style.display="none";}
</script>
</head>
<body>
<p id="op" style="position:absolute;width:100px;height:60px;border:1px solid silver;left:100px;top:100px;z-index:9999;">
<p id="move" onmousedown="Milan_StartMove(event,this.parentNode)" onmouseup="Milan_StopMove(event)"
style="cursor:move;width:100%;height:15px;background-color:#0066cc; font-size:10px;">
<p onclick="p_Close(this.parentNode.parentNode)" style="float:right; width:10px; height:100%; cursor:hand; background-color:#cc3333; color:White;font-size:15px;">X</p>
</p>
<span>测试一下</span>
</p>
<p id="disable_op" style="position:absolute;left:100px;top:100px;width:100px; height:60px; z-index:9998;FILTER:alpha(opacity=50);";>
<iframe src="about:blank" name="hiddenIframe" width="100%" frameborder="0" height="60px" title="遮盖层"></iframe></p>
<select name="ListHead1$DropDownList3" id="ListHead1_DropDownList3">
<option selected="selected" value=""></option>
<option value="2">3333</option>
<option value="6">1111</option>
<option value="B">222</option>
</select>
</body>
</html>现在这个可拖动的p是不是好很多了？不用担心select了。之前放出来的只能在IE下正常工作，主要是用了parentElement,现在把它换成parentNode,调整了CSS样式，这样在FF下也能正常运行了。
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