CRM 2011 JS giving errors

Question

I added an OnLoad Event to my Opportunity Form.  When the form loads I get the following error:  "Object doesn't support property or method 'setDisable'.  What am I doing wrong?
// Microsoft Dynamics CRM 2011 Java Script
// Name: New_Opportunity_New_Library
// Modified Date:  4/2/2015
// Company: 
// Practice Area SubPractice Area Code
function Form_OnSave()
function Form_OnLoad()
      setDisableSubPracticeArea()
function setDisableSubPracticeArea(){
      if (Xrm.Page.getAttribute("cpdc_primarypracticearea").getValue() == null){
      // If the value is null set field sub-practice area disable field
      Xrm.Page.getControl("cpdc_subpracticearea").setDisable(false);
      else  if (Xrm.Page.getAttribute("cpdc_primarypracticearea").getValue() != null){
      // if value is not null then set visible sub-practicearea field
      Xrm.Page.getControl("cpdc_subpracticearea").setDisable(true);

Answer 1

Hi,
Use below code :
function Form_OnSave() {
function Form_OnLoad() {
    setDisableSubPracticeArea()
function setDisableSubPracticeArea() {
    if (Xrm.Page.getAttribute("cpdc_primarypracticearea").getValue() == null) {
        // If the value is null set field sub-practice area disable field
        Xrm.Page.getControl("cpdc_subpracticearea").setDisabled(false);
    else if (Xrm.Page.getAttribute("cpdc_primarypracticearea").getValue() != null) {
        // if value is not null then set visible sub-practicearea field 
        Xrm.Page.getControl("cpdc_subpracticearea").setDisabled(true);
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