Changing location within Modal Dialog

Question

Hi,

In a simple web app I'm opening a modal window which loads a jsp using window.showModalDialog. I have the following questions:

1. I have a button in the JSP within the modal dialog. It has a click handler that says: document.location.href = 'http://www.google.com'. Problem is, when the button is clicked, the parent window's location changes and things go wrong. How can I ensure that when that button is clicked, the modal's window's url changes to google.com?

2. From the parent page that opened the modal window, how can I change the url of the modal window? Say from the parent window I opened dog.jsp in the modal window. Now, from the parent JSP, how can I change the location of that window to cat.jsp?

Thanks.