Simple dashboard application

I am trying to have some fun with dashboard widgets, so I tried a simple application :

There will be a button over the widget which when clicked will open StackOverflow website in safari.

To implement it, I tried this:

1. Created a custom dashboard widget.
2. Added a button to it from library.
3. Associated gotoStackOverflow handler with onclick event.

4. in body of function gotoStackOverflow, I wrote this code:

   window.open('https://stackoverflow.com/','Stackoverflow','width=400, height=300');

When I 'Run' the application I found no browser window appearing on click of the button.

Can anyone suggest me where I may be wrong or/ and some useful links to play with dashcode and dashboard widgets?

I have used following code to solve my problem:

function gotoStackOverflow(event)
{
    widget.openURL("http://stackoverflow.com/");
}

cheers... :)

Miraaj