这是作一个可拖动的层，但是拖动的很不自如。由于是从网上copy，部分代码不懂意思，请告知；
drag = 0
move = 0
function mouseUp() {
move = 0
}
function mouseDown() {
clickleft = window.event.x - parseInt(dragObj.style.left)
clicktop = window.event.y - parseInt(dragObj.style.top)
dragObj.style.zIndex += 1
move = 1
}
function mouseMove() {
if (move) {
dragObj.style.left = window.event.x - clickleft
dragObj.style.top = window.event.y - clicktop
}
}
function Show(divid) {
divid.filters.revealTrans.apply();//什么意思
divid.style.visibility = "visible";
divid.filters.revealTrans.play();//什么意思
}
function Hide(divid) {
divid.filters.revealTrans.apply();//什么意思
divid.style.visibility = "hidden";
divid.filters.revealTrans.play();//什么意思
}
//-->
1<div id="READ" style="FILTER: revealTrans(transition=23,duration=0.5) blendTrans(duration=0.5); LEFT: 100px; POSITION: absolute; TOP: 75px; WIDTH: 600px; Z-INDEX: 10">////什么意思
2<div align="center">
3<center>
4<table border="1" bordercolordark="#FFFFFF" bordercolorlight="#5E9BF7" cellpadding="0" cellspacing="0" width="90%">
5<tr bgcolor="#ffedc8">
6<td colspan="1"><div onmousedown="dragObj=READ;mouseDown()" onmousemove="mouseMove()" onmouseout="move=0" onmouseup="mouseUp()">标题栏 </div>
7<td width="1%"><a href="javascript:void(Hide(READ))">■</a>
8<tr>
9<td bgcolor="#cccccc" colspan="4">
10<table border="0" cellspacing="4" width="100%">
11<tr>
12<td>
13<font color="Blue">一个可以拖动和关闭的层，有意思的是它每次关闭的效果都不一样。一个可以拖动和关闭的层，有意思的是它每次关闭的效果都不一样。一个可以拖动和关闭的层，有意思的是它每次关闭的效果都不一样。
14</font></td></tr></table>
15</td></tr></td></td></tr></table>
16</center></div>
17\---------------------------------------------------------------
18
19试试看这个，很短。
20<span onmousedown="MouseDown(this)" onmousemove="MouseMove()" onmouseup="MouseUp()" style="position:absolute;width:200;height:200;background:blue;color:#ffffff;cursor:hand">aa</span>
21<script>
22var Obj
23function MouseDown(obj){
24Obj=obj
25Obj.setCapture()
26Obj.l=event.x-Obj.style.pixelLeft
27Obj.t=event.y-Obj.style.pixelTop
28}
29function MouseMove(){
30if(Obj!=null){
31Obj.style.left = event.x-Obj.l
32Obj.style.top = event.y-Obj.t
33}
34}
35function MouseUp(){
36if(Obj!=null){
37Obj.releaseCapture()
38Obj=null
39}
40}
41</script></div>