Attach an event in a child iframe to a handler in the parent window

I don't have access to this iframe's source directly, so I would like to do this, if it's possibly this way.

I have an iframe generated by JS:

<iframe name="temp_iframe" width="100%" height="95%" src="'+the_url+'"></iframe>

And inside is a submit button and a cancel button. The submit button works fine, but I want the cancel button to close this modal that is containing the iframe... I also want the submit button to send, then close the modal. Normally this would be easy, but im not sure how to setup an event in the parent window to a child DOM element of the iframe that affects the child's parent, the main window.

E.g. if this wasn't in an iframe and in jQuery:

$('[name=temp_iframe] button').live('click',function(){
    alert('click');
    return false;
});

EDIT: And also, it's on the same domain!