<script type="text/javascript">

function OnTreeNodeChecked() {
            var ele = event.srcElement;
            if (ele.type == 'checkbox') {
                var childrenDivID = ele.id.replace('CheckBox', 'Nodes');
                var div = document.getElementById(childrenDivID);
                if (div != null) {
                    var checkBoxs = div.getElementsByTagName('INPUT');
                    for (var i = 0; i < checkBoxs.length; i++) {
                        if (checkBoxs[i].type == 'checkbox')
                            checkBoxs[i].checked = ele.checked;
                    }
                    var div = GetParentByTagName(ele, 'DIV');
                    var checkBoxs = div.getElementsByTagName('INPUT');
                    var parentCheckBoxID = div.id.replace('Nodes', 'CheckBox');
                    var parentCheckBox = document.getElementById(parentCheckBoxID);
                    for (var i = 0; i < checkBoxs.length; i++) {
                        if (checkBoxs[i].type == 'checkbox' && checkBoxs[i].checked) {
                            parentCheckBox.checked = true;
                            return;
                        }
                    }
                    parentCheckBox.checked = false;
                }
                else {
                    var div = GetParentByTagName(ele, 'DIV');
                    var checkBoxs = div.getElementsByTagName('INPUT');
                    var parentCheckBoxID = div.id.replace('Nodes', 'CheckBox');
                    var parentCheckBox = document.getElementById(parentCheckBoxID);

var basediv = GetParentByTagName(parentCheckBox, 'DIV');
                    var parentCBKs = basediv.getElementsByTagName('INPUT');
                    var baseCheckBoxID = basediv.id.replace('Nodes', 'CheckBox');
                    var baseCheckBox = document.getElementById(baseCheckBoxID);

for (var i = 0; i < checkBoxs.length; i++) {
                        if (checkBoxs[i].type == 'checkbox' && checkBoxs[i].checked) {
                            parentCheckBox.checked = true;
                            for (var j = 0; j < parentCBKs.length; j++) {
                                if (parentCBKs[j].type == 'checkbox' && parentCBKs[j].checked) {
                                    baseCheckBox.checked = true;
                                }
                            }
                            return;
                        }
                    }
                    parentCheckBox.checked = false;
                    var checkedcount = 0;
                    for (var j = 0; j < parentCBKs.length; j++) {
                        if (parentCBKs[j].type == 'checkbox' && parentCBKs[j].checked) {
                            checkedcount++;
                        }
                    }
                    if (checkedcount == 0) {
                        baseCheckBox.checked = false;
                    }
                }

}
        }

function GetParentByTagName(element, tagName) {
            var parent = element.parentNode;
            var upperTagName = tagName.toUpperCase();
            while (parent && (parent.tagName.toUpperCase() != upperTagName)) {
                parent = parent.parentNode ? parent.parentNode : parent.parentElement;
            }
            return parent;
        } 
    </script>

------------------------------------cs

tv_rights.Attributes.Add("onclick", "OnTreeNodeChecked()");

就OK啦