table表格问题之javascript

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
<style>
.resizeDivClass
{
position:relative;
background-color:red;
width:2;
z-index:1;
left:expression(this.parentElement.offsetWidth-1);
cursor:e-resize;
}
</style>
<script language=javascript>
function MouseDownToResize(obj){
obj.mouseDownX=event.clientX;
obj.pareneTdW=obj.parentElement.offsetWidth;
obj.pareneTableW=theObjTable.offsetWidth;
obj.setCapture();
}
function MouseMoveToResize(obj){
    if(!obj.mouseDownX) return false;
    var newWidth=obj.pareneTdW*1+event.clientX*1-obj.mouseDownX;
    if(newWidth>0)
    {
obj.parentElement.style.width = newWidth;
//theObjTable.style.width=obj.pareneTableW*1+event.clientX*1-obj.mouseDownX;
}
}
function MouseUpToResize(obj){
obj.releaseCapture();
obj.mouseDownX=0;
}
</script>
</head>
<body>
拖动表列改变table的列宽度
<table id=theObjTable >
<tr bgcolor=cccccc >
<td valign=top nowrap="nowrap">
<font class="resizeDivClass" onmousedown="MouseDownToResize(this);" 
onmousemove="MouseMoveToResize(this);" onmouseup="MouseUpToResize(this);"></font>
列一</td>
<td valign=top nowrap="nowrap">
<font class="resizeDivClass" onmousedown="MouseDownToResize(this);" 
onmousemove="MouseMoveToResize(this);" onmouseup="MouseUpToResize(this);"></font>
列二</td>
<td valign=top nowrap="nowrap">
<font class="resizeDivClass" onmousedown="MouseDownToResize(this);" 
onmousemove="MouseMoveToResize(this);" onmouseup="MouseUpToResize(this);"></font>
列三</td>
</tr>
<tr>
<td>拖动表列改变table的列宽度</td><td>拖动表列改变table的列宽度</td><td>拖动表列改变table的列宽度</td>
</tr>
</table>
</body>
</html>