Nested DataList Parent-Child selection problem

See more:

C#

ASP.NET

Javascript

I have a web application which have a datalist within a datalist. The outer datalist make parent items and the inner one the child items both with checkboxes for selection. I am retrieving these items from a database.
THE PROBLEM:
1. I want the parent item to be checked/unchecked automatically if any of the children is checked/unchecked.
2. All the children should be checked if the parent is checked.

I just dont know how to do this with datalists. Although, I have implemented this logic in my code by the use of flags and count variables but I want it to be visible to users. Shall i use javascripts for that? But keeping in mind tht scripting has issues with browsers. IE is recommended browser.

Many thanks.
Technology Used is .NET 4.

Below is the code I hv used for implementing this logic in C#.

bool flag;
                bool Parentflag = false;
                int count = 0;//count=1 means only parent exists, count=2 means parent+child exists
                int labelID = 0;
                using (SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString()))
                {
                    BLL.Admin adminObj = new BLL.Admin(sqlcon.ConnectionString);
                    adminObj.DeletePriorPermissions(DropDownRoles.SelectedValue.ToString());
                    foreach (DataListItem lstitem in dlstMenu.Items)
                    {
                        //Code for iterating Parent Menu Items

                        if (lstitem.ItemType == ListItemType.Item || lstitem.ItemType == ListItemType.AlternatingItem)
                        {
                            flag = false;
                            Label lblPageIdParent = (Label)lstitem.FindControl("lblPageId");
                            CheckBox chkPageCaption = (CheckBox)lstitem.FindControl("chkPageCaption");
                            labelID = Convert.ToInt32(lblPageIdParent.Text);
                            if (chkPageCaption.Checked)
                            //Add Permissions for Parent Page
                            { 
                                adminObj.SavePagePermissions(1, Convert.ToInt32(lblPageIdParent.Text), DropDownRoles.SelectedValue.ToString());
                                Parentflag = false;
                                count = 1;
                            }
                            DataList dlstpage = (DataList)lstitem.FindControl("dlstpage");
                            foreach (DataListItem item in dlstpage.Items)
                            {
                                Parentflag = true;
                                if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
                                {                                    
                                    //parent checkbox
                                    CheckBox cbxPage = (CheckBox)item.FindControl("chkPageCaption");
                                    RadioButtonList rdoPermissions = (RadioButtonList)item.FindControl("rdoPermission");
                                    Label lblPageID = (Label)item.FindControl("lblPageId");
                                    if (cbxPage != null)
                                    {
                                        if (cbxPage.Checked)
                                        {
                                            //Check parent if any of the children is checked.
                                              if (!chkPageCaption.Checked)
                                            {
                                                //Save permissions for parent item only once.
                                                if (!flag)
                                                {
                                                    adminObj.SavePagePermissions(1, Convert.ToInt32(lblPageIdParent.Text), DropDownRoles.SelectedValue.ToString());
                                                    flag = true;
                                                }
                                            }
                                            foreach (ListItem rdlst in rdoPermissions.Items)
                                            {
                                                if (rdlst.Selected)
                                                {
                                                    //Save Permissions for child items.
                                                    adminObj.SavePagePermissions(Convert.ToInt32(rdlst.Value), Convert.ToInt32(lblPageID.Text), DropDownRoles.SelectedValue.ToString());
                                                    Parentflag = true;
                                                    count = 2;
                                                }                                              
                                            }
                                        }
                                    }
                                }
                            }                           
                        }
                        //Delete entry for parent item if none of the children is selected.
                        if (count != 0)
                        {
                            if (Parentflag==true && count == 1)
                                adminObj.ExecuteSQL("DELETE FROM [tbl_PagePermissions] WHERE PAGEID = " + labelID + " AND ROLEID = '" + DropDownRoles.SelectedValue.ToString() + "'", sqlcon.ConnectionString);
                        }
                    }