探讨javascript+vml，有vml高手吗？请进....

好郁闷，有vml大虾吗？怎么取得页面中的矩形？像以前，引进的图片只要取得图片标签即img就能得到图片，可是vml画的矩形是以v:rect开头的，取标签v:rect时出错，不能这样取，怎么办？有开发过vml的吗？
<HTML xmlns:v>
<head>
<STYLE>v\:*{behavior:url(#default#VML);
t:expression(this.ondragstart=function(){startDrag(this)});
e:expression(this.ondragend=function(){endDrag(this)});
}
< !--
.skin0 {
position:absolute;
text-align:left;
width:200px;
border:2px solid black;
background-color:menu;
font-family:Verdana;
line-height:20px;
cursor:default;
visibility:hidden;
}
.skin1 {
cursor:default;
font:menutext;
position:absolute;
text-align:left;
font-family: Arial, Helvetica, sans-serif;
font-size: 10pt;
width:120px;
background-color:menu;
border:1 solid buttonface;
visibility:hidden;
border:2 outset buttonhighlight;
}
.menuitems {
padding-left:15px;
padding-right:10px;
}
--></STYLE>
<SCRIPT language="javascript">
var start_x=0;
var start_y=0;
var end_x=0;
var end_y=0;function startDrag(obj)
{
  start_x=obj.currentStyle.left;
  start_y=obj.currentStyle.top;
}function endDrag(obj)
{
  end_x=event.clientX;
  end_y=event.clientY;
  obj.style.left=(parseInt(obj.currentStyle.left)+end_x-parseInt(start_x)).toString()+'px';
  obj.style.top=(parseInt(obj.currentStyle.top)+end_y-parseInt(start_y)).toString()+'px';
}
function MouseOver()
{
  Obj=event.srcElement;
  Obj.runtimeStyle.cursor = "hand";
  Obj.style.color="black";
}
function move()
{if(obj!=null)
{
obj.style.left=event.x-x;
obj.style.top=event.y-y;
}event.returnValue=false;
}
function up()
{
if(obj!=null){
obj.releaseCapture();

obj=null;

}
}
function MouseOut()
{
Obj.runtimeStyle.cursor="default";
   Obj=null;
} var menuskin = "skin1"; // skin0, or skin1
var display_url = 0; // Show URLs in status bar?
function showmenuie5() {
var rightedge = document.body.clientWidth-event.clientX;
var bottomedge = document.body.clientHeight-event.clientY;
ie5menu.style.zIndex=10000;
if (rightedge < ie5menu.offsetWidth)
ie5menu.style.left = document.body.scrollLeft + event.clientX -
ie5menu.offsetWidth;
else
ie5menu.style.left = document.body.scrollLeft + event.clientX;
if (bottomedge < ie5menu.offsetHeight)
ie5menu.style.top = document.body.scrollTop + event.clientY -
ie5menu.offsetHeight;
else
ie5menu.style.top = document.body.scrollTop + event.clientY;
ie5menu.style.visibility = "visible";
return false;
}
function hidemenuie5() {
ie5menu.style.visibility = "hidden";
}
function highlightie5() {
if (event.srcElement.className == "menuitems") {
event.srcElement.style.backgroundColor = "highlight";
event.srcElement.style.color = "white";
if (display_url)
window.status = event.srcElement.url;
}
}
function lowlightie5() {
if (event.srcElement.className == "menuitems") {
event.srcElement.style.backgroundColor = "";
event.srcElement.style.color = "black";
window.status = "";
}
}
function jumptoie5() {
if (event.srcElement.className == "menuitems") {
if (event.srcElement.getAttribute("target") != null)
window.open(event.srcElement.url, event.srcElement.getAttribute("target"));
else
window.location = event.srcElement.url;
}
}
</SCRIPT>
<div id="ie5menu" class="skin0" onMouseover="highlightie5()"
onMouseout="lowlightie5()" 　　onClick="jumptoie5()" Z-INDEX:10000>
<div class="menuitems" url="javascript:history.back();"><a href="#" onclick="history.back()">返回</div><hr>
<div class="menuitems" url="http://www.163.com"><a target="_blank" href="http://www.163.com">网易</a></div>
<div class="menuitems" url="http://www.sohu.com"><a target="_blank" href="http://www.sohu.com">搜狐</a></div>
<hr>
<div class="menuitems" url="http://www.sina.com.cn"><a target="_blank" href="http://www.sina.com.cn">新浪</a></div>
<div class="menuitems" url="http://www.yahoo.com.cn"><a target="_blank" href="http://www.yahoo.com.cn">雅虎</a></div>
</div>
<script language="JavaScript1.2">
if (document.all && window.print) {
ie5menu.className = menuskin;document.body.onclick = hidemenuie5;
}</script></head>
<BODY>
<DIV>
<v:rect id=vml1 style="Z-INDEX:3003;LEFT:418;WIDTH:67;POSITION:absolute;TOP:207;HEIGHT:60" fillcolor="red" strokecolor="green" strokeweight="2px" onmouseover="MouseOver();fillcolor='blue'" onmouseout="fillcolor='red'" oncontextmenu="showmenuie5();return false" />
</DIV>
<DIV>
<v:rect id=vml2 style="Z-INDEX:3003;LEFT:621;WIDTH:67;POSITION:absolute;TOP:378;HEIGHT:60" fillcolor="red" strokecolor="green" strokeweight="2px" onmouseover="MouseOver();fillcolor='blue'" onmouseout="fillcolor='red'" oncontextmenu="showmenuie5();return false"/>
</DIV>
<DIV>
<v:rect id=vml3 style="Z-INDEX:3003;LEFT:791;WIDTH:67;POSITION:absolute;TOP:205;HEIGHT:60" fillcolor="red" strokecolor="green" strokeweight="2px" onmouseover="MouseOver();fillcolor='blue'" onmouseout="fillcolor='red'" oncontextmenu="showmenuie5();return false"/>
</DIV>
<DIV id='div4'><v:line id=vml5 style="Z-INDEX:3014;LEFT:503;POSITION:absolute;TOP:237" from="0,0" to="275,0" strokecolor="green" strokeweight="2px" onmouseover="MouseOver();strokecolor='black'" onmouseout="strokecolor='green'" title="网元间关系"/>
</div>
<DIV id='div5'><v:line id=vml6 style="Z-INDEX:3015;LEFT:820;POSITION:absolute;TOP:281" from="0,0" to="-125,125" strokecolor="green" strokeweight="2px" onmouseover="MouseOver()" title="网元间关系"/>
</div>
<DIV id='div6'><v:line id=vml7 style="Z-INDEX:3016;LEFT:454;POSITION:absolute;TOP:282" from="0,0" to="160,125" strokecolor="green" strokeweight="2px" onmouseover="MouseOver()" title="网元间关系"/>
</div>
</body></HTML>
效果不尽如人意，老板需要的是随时都跟随鼠标的那种拖动，有高手吗？快来拿分，帮帮忙。
拖动这个，我前两天开发的时候也试了一下，发现不行！不支持拖动，onDrag这个事件不支持，查了一下参考，onDrag是属于编辑事件，可能跟这个有关！如果支持，那就没什么问题了！

调试易

探讨javascript+vml，有vml高手吗？请进....

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