function OnTreeNodeChecked(object)
    {
        var element = window.event.srcElement;
        if (!IsCheckBox(element))
            return;

        var isChecked = element.checked;
        var tree = object;//TV2_GetTreeById("SubSysTree");
        var node = TV2_GetNode(tree,element);

        TV2_SetChildNodesCheckStatus(node,isChecked);

        var parent = TV2_GetParentNode(tree,node);
        TV2_NodeOnChildNodeCheckedChanged(tree,parent,isChecked);

    }



/***************************************************************************************
Name: Client Javascript for ASP.NET 2.0 TreeView
Description: ASP.NET 2.0 TreeView lack for client operation. This set
of functions provide
    some supports. Includes:
    * get node
    * change checkbox status of parent and child nodes

Author: Zhangtao, zhangtao.it@gmail.com
Date: 2006-03-30
Commonts:
***************************************************************************************/

//set child nodes checkbox status
function TV2_SetChildNodesCheckStatus(node,isChecked)
{
    var childNodes = TV2i_GetChildNodesDiv(node);
    if(childNodes == null)
        return;

    var inputs = WebForm_GetElementsByTagName(childNodes,"INPUT");
    if(inputs == null || inputs.length == 0)
        return;

    for(var i = 0; i < inputs.length; i++)
    {
        if(IsCheckBox(inputs[i]))
            inputs[i].checked = isChecked;
    }
}

//change parent node checkbox status after child node changed
function TV2_NodeOnChildNodeCheckedChanged(tree,node,isChecked)
{
    if(node == null)
        return;
    var parent;
    if(isChecked&!TV2_NodeGetChecked(node))
    {
        TV2_NodeSetChecked(node,isChecked);
        parent = TV2_GetParentNode(tree,node);
        TV2_NodeOnChildNodeCheckedChanged(tree,parent,isChecked);
        return;
    }
    
    if(!isChecked)
    {
         var childNodes = TV2_GetChildNodes(tree,node);

         if(childNodes == null || childNodes.length == 0)
             return;

         var isAllSame = true;

         for(var i = 0; i < childNodes.length; i++)
         {
               var item = childNodes[i];
              var value = TV2_NodeGetChecked(item);

             if(isChecked != value)
             {
                isAllSame = false;
                break;
             }
         }

         parent = TV2_GetParentNode(tree,node);
         if(isAllSame)
        {
             TV2_NodeSetChecked(node,isChecked);
             TV2_NodeOnChildNodeCheckedChanged(tree,parent,isChecked);
         } 
    }     
}

//get node relative element(etc. checkbox)
function TV2_GetNode(tree,element)
{
    var id = element.id.replace(tree.id,"");
    id = id.toLowerCase().replace(element.type,"");
    id = tree.id + id;

    var node = document.getElementById(id);
    if(node == null) //leaf node, no "A" node
        return element;
    return node;
}

//get parent node
function TV2_GetParentNode(tree,node)
{
    var div = WebForm_GetParentByTagName(node,"DIV");

    //The structure of node: <table>information of node</table><div>child nodes</div>
    var table = div.previousSibling;
    if(table == null)
        return null;

    return TV2i_GetNodeInElement(tree,table);
}

//get child nodes array
function TV2_GetChildNodes(tree,node)
{
    if(TV2_NodeIsLeaf(node))
        return null;

    var children = new Array();
    var div = TV2i_GetChildNodesDiv(node);
    var index = 0;

    for(var i = 0; i < div.childNodes.length; i++)
    {
        var element = div.childNodes[i];
        if(element.tagName != "TABLE")
            continue;

        var child = TV2i_GetNodeInElement(tree,element);
        if(child != null)
            children[index++] = child;
    }
    return children;
}

function TV2_NodeIsLeaf(node)
{
    return !(node.tagName == "A"); //Todo
}

function TV2_NodeGetChecked(node)
{
    var checkbox = TV2i_NodeGetCheckBox(node);
    return checkbox.checked;
}

function TV2_NodeSetChecked(node,isChecked)
{
    var checkbox = TV2i_NodeGetCheckBox(node);
    if(checkbox != null)
     checkbox.checked = isChecked;
}

function IsCheckBox(element)
{
    if(element == null)
        return false;
    return (element.tagName == "INPUT" && element.type.toLowerCase() ==
"checkbox");
}

//get tree
function TV2_GetTreeById(id)
{
    return document.getElementById(id);
}

//private mothods, with TV2i_ prefix

//get div contains child nodes
function TV2i_GetChildNodesDiv(node)
{
    if(TV2_NodeIsLeaf(node))
        return null;

    var childNodsDivId = node.id + "Nodes";
    return document.getElementById( childNodsDivId );
}

//find node in element
function TV2i_GetNodeInElement(tree,element)
{
    var node = TV2i_GetNodeInElementA(tree,element);
    if(node == null)
    {
        node = TV2i_GetNodeInElementInput(tree,element);
    }
    return node;
}

//find "A" node
function TV2i_GetNodeInElementA(tree,element)
{
    var as = WebForm_GetElementsByTagName(element,"A");
    if(as== null || as.length == 0)
        return null;

    var regexp = new RegExp("^" + tree.id + "n\\d+$");

    for(var i = 0; i < as.length; i++)
    {
        if(as[i].id.match(regexp))
        {
            return as[i];
        }
    }
    return null;
}

//find "INPUT" node
function TV2i_GetNodeInElementInput(tree,element)
{
    var as = WebForm_GetElementsByTagName(element,"INPUT");
    if(as== null || as.length == 0)
        return null;

    var regexp = new RegExp("^" + tree.id + "n\\d+");

    for(var i = 0; i < as.length; i++)
    {
        if(as[i].id.match(regexp))
        {
            return as[i];
        }
    }
    return null;
}

//get checkbox of node
function TV2i_NodeGetCheckBox(node)
{
    if(IsCheckBox(node))
        return node;

    var id = node.id + "CheckBox";
    return document.getElementById(id); 
}
//get imgurl
function TreeView_GetImgUrl(node) {
    var trNode = WebForm_GetParentByTagName(node, "TR");
    var outerNodes;  
    var imgNode; 
    if (trNode.childNodes[trNode.childNodes.length - 2].getElementsByTagName) {
        outerNodes = trNode.childNodes[trNode.childNodes.length - 2].getElementsByTagName("A");
        if (!outerNodes || outerNodes.length == 0) {
            outerNodes = trNode.childNodes[trNode.childNodes.length - 2].getElementsByTagName("SPAN");
        }
    }
    var outerNode = (outerNodes && outerNodes.length > 0) ?
        outerNodes[0]:
        trNode.childNodes[trNode.childNodes.length - 2];
        if(outerNode && outerNode.children.length>0)
            imgNode=outerNode.children[0];
    return (imgNode && imgNode.tagName=='IMG') ? imgNode.src : "";
}