Custom Web Part as a Modal Pop Up

Hi..

I want to display a custom web part page as a modal popup when we click a button...

i implemented this code

function openBasicDialog() {    var options = {
             url: '/SitePages/ChangeAccountStatus.aspx?IsDlg=1',
             title: 'Google'
         };
         SP.UI.ModalDialog.showModalDialog(options);
         return false;
     }

but getting an error as below

Ravindranath