I am doing a pop up on my home page using the following link

```
<a href="CreateUser.aspx" target="_blank"

 onclick="window.open('CreateUser.aspx', 'windowname',

'width=500,height=400,toolbar=no,status=no,menubar=no,scrollbars=no,resizable=no,directories=no,location=no'); return false">Create users</a>

```

But when this window is opened I am able to navigate in the home page, which I want to disable until user clicks ok or cancel in the create users page. How to do that.