function OnTreeClick(evt, treeViewId) {
    var src = window.event != window.undefined ? window.event.srcElement : evt.target;
    var isChkBoxClick = (src.tagName.toLowerCase() == "input" && src.type == "checkbox");
    if (isChkBoxClick) {
        if (src.checked) {
            var parentTable = GetParentByTagName("table", src);
            var nxtSibling = parentTable.nextSibling;
            if (nxtSibling && nxtSibling.nodeType == 1) {
                if (nxtSibling.tagName.toLowerCase() == "div") {
                    var atpos = src.id.indexOf("CheckBox");
                    var str = src.id.substring(0, atpos);
                   $('#' + str + ' img').attr("src", "/img/iconMinus.gif")
                   $('#' + nxtSibling.id).css("display", "block");
                }
            }
        }                  
    }
}

function LimitTreeSelection(limit) {

    $('#industrysector :input').each(function() {
        $(this).click(function() {
            var src = window.event != window.undefined ? window.event.srcElement : evt.target;
            CheckUncheckParents(src, src.checked);
            var count = 0;
            $('#industrysector :input').each(function() {
                if ($(this).is(':checked')) {
                    if ($(this).parent().prev().children().html() != "") {
                        count++;

                        if (count == limit) {
                            $('#industrysector :input').each(function() {
                                if (!$(this).is(':checked')) {
                                    $(this).attr("disabled", "true");
                                }
                            });
                        } else {
                            $('#industrysector :input').each(function() {
                                $(this).removeAttr("disabled");
                            });
                        }
                    }
                }
            });
        });
    });

}

function CheckUncheckChildren(childContainer, check) {
    var childChkBoxes = childContainer.getElementsByTagName("input");
    var childChkBoxCount = childChkBoxes.length;
    for (var i = 0; i < childChkBoxCount; i++) {
        childChkBoxes[i].checked = check;
    }
}

function CheckUncheckParents(srcChild, check) {

    var parentDiv = GetParentByTagName("div", srcChild);
    var parentNodeTable = parentDiv.previousSibling;
    if (parentNodeTable) {
        var checkUncheckSwitch;
        if (check) //checkbox checked
        {
            //  var isAllSiblingsChecked = AreAllSiblingsChecked(srcChild);
            var isAllSiblingsChecked = true;
            if (isAllSiblingsChecked)
                checkUncheckSwitch = true;
            else
                return; //do not need to check parent if any(one or more) child not checked
        }
        else //checkbox unchecked
        {
            checkUncheckSwitch = false;
        }

        var inpElemsInParentTable = parentNodeTable.getElementsByTagName("input");
        if (inpElemsInParentTable.length > 0) {
            var parentNodeChkBox = inpElemsInParentTable[0];
            parentNodeChkBox.checked = checkUncheckSwitch;
            //do the same recursively
            CheckUncheckParents(parentNodeChkBox, checkUncheckSwitch);
        }
    }
}

function AreAllSiblingsChecked(chkBox) {
    var parentDiv = GetParentByTagName("div", chkBox);
    var childCount = parentDiv.childNodes.length;
    for (var i = 0; i < childCount; i++) {
        if (parentDiv.childNodes[i].nodeType == 1) {
            //check if the child node is an element node
            if (parentDiv.childNodes[i].tagName.toLowerCase() == "table") {
                var prevChkBox = parentDiv.childNodes[i].getElementsByTagName("input")[0];
                //if any of sibling nodes are not checked, return false
                if (!prevChkBox.checked) {
                    return false;
                }
            }
        }
    }
    return true;
}

//utility function to get the container of an element by tagname
function GetParentByTagName(parentTagName, childElementObj) {
    var parent = childElementObj.parentNode;
    while (parent.tagName.toLowerCase() != parentTagName.toLowerCase()) {
        parent = parent.parentNode;
    }
    return parent;
}