怎么通过表格拖拽来交换单元格数据？

<html>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=gb2312">
<TITLE>拖动</TITLE>
<STYLE>
td{width:20%;height:20px;border-bottom:1px solid black;border-right:1px solid black;cursor:default;}
div{font-size:13px;}
th{height:20px;font-size:12px;font-weight:normal;border-bottom:2px solid black;background-color:#CCCCCC}
table{border:1px solid black;font-size:13px;}
</STYLE>
<script language="javascript">
/************************************ dragedTableData.js *******************************/
/*一个对表格进行拖拽来交换单元格数据的脚本
* created by LxcJie 2004.4.12
* 可以实现表格内容的内部拖动
* 确保中间过度层的存在，id为指定
* 修改者邓华锋(博客：http://www.denghuafeng.com)
* 功能实现：兼容火狐
* 解决问题：
* 1.event的获取
* 2.event的event.srcElement ? event.srcElement: event.target;
* 3.Table.cells不兼容火狐改用遍历rows再遍历cells
* 4.event的横纵标和纵坐标的获取。var x=event.x||event.pageX; var y=event.y||event.pageY;
* 5.document.all改成document.getElementById
*/
/*--------全局变量-----------*/
var dragedTable_x0, dragedTable_y0, dragedTable_x1, dragedTable_y1;
var dragedTable_movable = false;
var dragedTable_preCell = null;
var dragedTable_normalColor = null;
//起始单元格的颜色
var dragedTable_preColor = "lavender";
//目标单元格的颜色
var dragedTable_endColor = "#FFCCFF";
var dragedTable_movedDiv = "dragedTable_movedDiv";
var dragedTable_tableId = "";
/*--------全局变量-----------*/
function DragedTable(tableId) {
dragedTable_tableId = tableId;
var oTempDiv = document.createElement("div");
oTempDiv.id = dragedTable_movedDiv;
oTempDiv.onselectstart = function() {
return false
};
oTempDiv.style.cursor = "hand";
oTempDiv.style.position = "absolute";
oTempDiv.style.border = "1px solid black";
oTempDiv.style.backgroundColor = dragedTable_endColor;
oTempDiv.style.display = "none";
document.body.appendChild(oTempDiv);
document.getElementById(tableId).onmousedown = showDiv;
}
function getEvent() {
if (document.all) {
    return window.event; //如果是ie
}
func = getEvent.caller;
while (func != null) {
var arg0 = func.arguments[0];
if (arg0) {
if ((arg0.constructor == Event || arg0.constructor == MouseEvent) || (typeof(arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
return arg0;
}
}
func = func.caller;
}
return null;
}
//得到控件的绝对位置
function getPos(cell) {
var pos = new Array();
var t = cell.offsetTop;
var l = cell.offsetLeft;
while (cell = cell.offsetParent) {
t += cell.offsetTop;
l += cell.offsetLeft;
}
pos[0] = t;
pos[1] = l;
return pos;
}
//显示图层
function showDiv() {
var event = getEvent();
var obj = event.srcElement ? event.srcElement: event.target;
var pos = new Array();
  //获取过度图层
  var oDiv = document.getElementById(dragedTable_movedDiv);
  if (obj.tagName.toLowerCase() == "td") {
   obj.style.cursor = "hand";
   pos = getPos(obj);
    //计算中间过度层位置，赋值
    oDiv.style.width = obj.offsetWidth;
    oDiv.style.height = obj.offsetHeight;
    oDiv.style.top = pos[0];
    oDiv.style.left = pos[1];
    oDiv.innerHTML = obj.innerHTML;
    oDiv.style.display = "";
    dragedTable_x0 = pos[1];
    dragedTable_y0 = pos[0];
    dragedTable_x1 = event.clientX;
    dragedTable_y1 = event.clientY;
    //记住原td
    dragedTable_normalColor = obj.style.backgroundColor;
    obj.style.backgroundColor = dragedTable_preColor;
    dragedTable_preCell = obj;
    dragedTable_movable = true;
}
}
function dragDiv() {
if (dragedTable_movable) {
var event = getEvent();
var oDiv = document.getElementById(dragedTable_movedDiv);
var pos = new Array();
var x=event.x||event.pageX;
var y=event.y||event.pageY;
var posX=0;
var posY=0;
var td;
var oTable = document.getElementById(dragedTable_tableId);
var rowslength=oTable.rows.length;
var cellslength=0;
oDiv.style.top = event.clientY - dragedTable_y1 + dragedTable_y0;
oDiv.style.left = event.clientX - dragedTable_x1 + dragedTable_x0;
for(var j=1;j<rowslength;j++){
cellslength=oTable.rows[j].cells.length;
for (var i = 0; i < cellslength; i++) {
td=oTable.rows[j].cells[i];
if (td.tagName.toLowerCase() == "td") {
pos = getPos(td);
posX=pos[1];
posY=pos[0];
if (x > posX && x < posX + td.offsetWidth && y >posY && y < posY + td.offsetHeight) {
if (td != dragedTable_preCell) td.style.backgroundColor = dragedTable_endColor;
} else {
if (td != dragedTable_preCell) td.style.backgroundColor = dragedTable_normalColor;
}
}
}
}
}
}
function hideDiv() {
if (dragedTable_movable) {
var event = getEvent();
var x=event.x||event.pageX;
var y=event.y||event.pageY;
var oTable = document.getElementById(dragedTable_tableId);
var pos = new Array();
var posX=0;
var posY=0;
var td;
var rowslength=oTable.rows.length;
var cellslength=0;
if (dragedTable_preCell != null) {
for(var j=1;j<rowslength;j++){
cellslength=oTable.rows[j].cells.length;
for (var i = 0; i < cellslength; i++) {
td=oTable.rows[j].cells[i];
pos = getPos(td);
posX=pos[1];
posY=pos[0];
//计算鼠标位置，是否在某个单元格的范围之内
if (x >posX && x < posX + td.offsetWidth && y > posY && y < posY + td.offsetHeight) {
if (oTable.rows[j].cells[i].tagName.toLowerCase() == "td") {
//交换文本
dragedTable_preCell.innerHTML = td.innerHTML;
td.innerHTML = document.getElementById(dragedTable_movedDiv).innerHTML;
//清除原单元格和目标单元格的样式
dragedTable_preCell.style.backgroundColor = dragedTable_normalColor;
td.style.backgroundColor = dragedTable_normalColor;
td.style.cursor = "";
dragedTable_preCell.style.cursor = "";
dragedTable_preCell.style.backgroundColor = dragedTable_normalColor;
}
}
}
}
}
dragedTable_movable = false;
    //清除提示图层
    document.getElementById(dragedTable_movedDiv).style.display = "none";
}
}
document.onmouseup = function() {
hideDiv();
var oTable = document.getElementById(dragedTable_tableId);
for(var j=1;j<oTable.rows.length;j++){
for (var i = 0; i < oTable.rows[j].cells.length; i++) oTable.rows[j].cells[i].style.backgroundColor = dragedTable_normalColor;
}
}
document.onmousemove = function() {
dragDiv();
}
/************************************ dragedTableData.js 结束 *******************************/
</script>
<script language="javascript">
function init()
{
//注册可拖拽表格
new DragedTable("tableId");
}
</script>
</HEAD>
<BODY oncontextmenu="return false;" onLoad="init()">
<TABLE id="tableId" width="70%" align="center" cellpadding="0" cellspacing="0">
<tbody>
<TR>
<TH colspan="4" style="">拖动交换单元格内容</TH>
</TR>
<TR>
<TD>Java</TD>
<TD>Java One </TD>
<TD>JBuilder</TD>
<TD>Stuts</TD>
</TR>
<TR>
<TD>C++</TD>
<TD>Visual Studio</TD>
<TD>Office</TD>
<TD>Windows</TD>
</TR>
<TR>
<TD>PhotoShop</TD>
<TD>Java</TD>
<TD>Illustrator</TD>
<TD>PageMaker</TD>
</TR>
<TR>
<TD>Cartoon</TD>
<TD>Telephone</TD>
<TD>China</TD>
<TD>USA</TD>
</TR>
<TR>
<TD>Java</TD>
<TD>Java One </TD>
<TD>JBuilder</TD>
<TD>Stuts</TD>
</TR>
<TR>
<TD>C++</TD>
<TD>Visual Studio</TD>
<TD>Office</TD>
<TD>Windows</TD>
</TR>
<TR>
<TD>PhotoShop</TD>
<TD>Flash</TD>
<TD>Illustrator</TD>
<TD>PageMaker</TD>
</TR>
<TR>
<TD>Cartoon</TD>
<TD>Telephone</TD>
<TD>China</TD>
<TD>USA</TD>
</TR>
</tbody>
</TABLE>
</BODY>
</HTML>

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怎么通过表格拖拽来交换单元格数据？

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