setting focus in an iframe

[sillysillysilly]

I have an iframe that I am loading a form from another website into.  What I want to do is to automatically set the focus on a button in their form.  I can find the value of the form but cannot seem to set the focus then cause a click to occur.  I can find buttons in my parent frame just fine and set focus and click buttons.

 

I am using a syntax like this.

 

window.frames["formFrame"].focus();

$('#Submit').window.frames["formFrame"].focus();

any ideas.