IE6中释放form节点遇到的问题

在尝试修改Ext库，完善内存释放时发现
不管怎么改，form节点都一直释放不掉
自己写例子时，就算创建了dom节点后只赋给一个变量，sIEve显示的引用也有3个
抓狂了很久以后，上网查了下资料，发现是IE在作怪：
http://blog.archive.jpsykes.com/92/ie6-form-tag-orphans/index.html
作者也试过很多办法来清除，无一例外全失败了。

引用

Approaches Tested

    * innerHTML on parent (most common garbage collection)
    * Using removeNode, rather than removeChild
    * Using replaceNode before removing it
    * Resetting all variables before removing it
    * Giving it a HasLayout (I was desperate)
    * Setting AutoComplete to off on the form
    * collectGarbage()
    * Crockfords Purge
    * …

后面给的一个例子，其实是重用form节点：

function MyForm() {
	this.InstanceId = ''+MyForm.InstanceCounter++;
	MyForm.Instances[this.InstanceId] = this;
	for( var key in MyForm.Recycle ) {
		this.Node = MyForm.Recycle[key];
		delete MyForm.Recycle[key];
	}
	if( this.Node==null ) {
		this.Node = document.createElement('FORM');
	}
	this.Node.InstanceId = this.InstanceId;
}

MyForm.prototype.InstanceId = null;
MyForm.prototype.Node = null;

MyForm.prototype.destroy = function() {
	if( this.Node.parentNode ) this.Node.parentNode.removeChild(this.Node);
	MyForm.Recycle[this.InstanceId] = this.Node;
	delete MyForm.Instances[this.InstanceId];
	this.Node = null;
}

MyForm.InstanceCounter = 1;
MyForm.Instances = {};
MyForm.Recycle = {};

// create and destroy 10000 forms
var a;
for( var i = 0; i <= 5000; i++){

	//create a new form
	var b = new MyForm();
	// add the new form to the body
	var a = document.body.appendChild(b.Node);
	//destroy the form
	b.destroy();
	//break;

}

无奈中。。。又不敢直接修改Ext框架的逻辑
看在这个节点占用内存也不多的面子上，不管它了。