enable a checkbox

[greeny_1984]

hi,
i have a application in which my need is to make a child checkbox enabled false on page load.When user clicks on parent checkbox ,child checkboxes become enabled true.
i have used javascript to achieve this function.
my javascript goes like this

for (i=1; i<inputs.length; i++) //if childNode type is CheckBox 
                             {
                           
                                                                          
                                                      if (inputs[i].type =="checkbox")
                                                             {
                                        
                                                                       var chk=$get(inputs[i].id);
                                            
                                                                        if(id.checked == true)
                                                                             {
                                                                                                                                                 chk.parentElement.removeAttribute('disabled');    
                                                            
                                                              
                                                                               }
                                                                          else
                                                                                                {
                                                                                                                                                                                                             chk.parentElement.setAttribute('disabled','true');
                                                                          
                                                                                                                                                                                                        }

                                           
                                        }

in edit mode of the page i want the checkboxes checked by the user to be enabled.
but when iam using code to enable true.iam not able to do it.
my code in server side

chk.Attributes.Add("disabled", "false");
                                    chk.Checked = true;

but iam not achieve this.

can any one solve my problem.