function goDeeperChecked(obj){
    var chk1 = true;
    //Get the mom.
    var head1 = obj.parentElement.previousSibling;
    //no Table, cant do my work.
    if (head1.tagName != "TABLE"){return ;} 
    //This is how may rows are at this level.
    var pTreeLevel1
    if (obj.rows == null || obj.rows == "undefined"){
        pTreeLevel1 = head1.rows[0].cells.length;
    }else{
        pTreeLevel1 = obj.rows[0].cells.length;
    } 
    //Are we a mommy?
    if(head1.tagName == "TABLE"){
        //Get the list of rows ahead of us.
        var tbls = obj.parentElement.getElementsByTagName("TABLE");
        //get the count of that list.
        var tblsCount = tbls.length; 
        //determine if any of the rows underneath are unchecked.
        for (i=0; i < tblsCount; i++){
            var childTreeLevel = tbls[i].rows[0].cells.length;
            if (childTreeLevel = pTreeLevel1){
                var chld = tbls[i].getElementsByTagName("INPUT");
                if (chld[0].checked == false){
                    chk1 = false;
                    break;
                }
            }
        }
        var nd = head1.getElementsByTagName("INPUT");
        nd[0].checked = chk1;
        //do the same for the level above
        goDeeperChecked(obj.parentElement);
    }else{
        return;
    }
}
function goDeeper(check, obj){
    //head1 gets the parent node of the unchecked node
    var head = obj.parentElement.previousSibling; 
    if(head.tagName == "TABLE"){
        //checks for the input tag which consists of checkbox
        var matchElement = head.getElementsByTagName("INPUT"); 
        //matchElement1[0] gives us the checkbox and it is unchecked
        matchElement[0].checked = false;
    }else{
        head = obj.parentElement.previousSibling;
    } 
    if(head.tagName == "TABLE"){
        goDeeper(check, obj.parentElement);
    }else{
        return;
    }
}
function treeViewCheck(){
    // obj gives us the node on which check or uncheck operation has performed    
    var obj = window.event.srcElement;
    var treeNodeFound = false; 
    var checkedState;
    //checking whether obj consists of checkbox to avoid exception 
    if (obj.tagName == "INPUT" && obj.type == "checkbox"){
        var treeNode = obj;
        checkedState = treeNode.checked; 
        //work our way back to the parent <table> element 
        do{
            obj = obj.parentElement;
        }while (obj.tagName != "TABLE") 
        var parentTreeLevel = obj.rows[0].cells.length;
        var parentTreeNode = obj.rows[0].cells[0];
        //get all the TreeNodes inside the TreeView (the parent <div>)
        var tables = obj.parentElement.getElementsByTagName("TABLE"); 
        //checking for any node is checked or unchecked during operation
        if(obj.tagName == "TABLE"){
            // if any node is unchecked then their parent node are unchecked 
            if (!treeNode.checked){
                goDeeper(false, obj);
            } //end if - unchecked
            //total number of TreeNodes
            var numTables = tables.length 
if (numTables >= 1)
{
//cycle through all the TreeNodes
//until we find the TreeNode we checked
 
for (i=0; i < numTables; i++)
{
if (tables[i] == obj)
{
treeNodeFound = true;
i++;
if (i == numTables)
{
//if we're on the last TreeNode, we are done
break;
}
}
if (treeNodeFound == true)
{
var childTreeLevel = tables[i].rows[0].cells.length;
if (childTreeLevel > parentTreeLevel)
{
var cell = tables[i].rows[0].cells[childTreeLevel - 1];
//set the checkbox to match the checkedState
 
var inputs = cell.getElementsByTagName("INPUT");
inputs[0].checked = checkedState;
}
 
else
{
//if any of the preceding TreeNodes are not deeper stop
break;
}
} //end if
 
}//end for
} //end if - numTables >= 1
 
// if all child nodes are checked then their parent node is checked
if (treeNode.checked)
{
goDeeperChecked(obj);
}//end if - checked
 
} //end if - tagName = TABLE
 
} //end if
 
} //end function