closing a popup window

[meerkat]

I have a simple web app that opens a popup window.
Simple enough.. I can open the popup window.
How do I close it under program control?

The javascript function allows the popup to open
function popitup(url) {
newwindow=window.open(url,'name','height=600,width=800,top=200,left=200');
if (window.focus) {newwindow.focus()}
return false;
}


I can open a popup with a link that works

<a href='pop' target='pop' onclick="return popitup('http://www.google.com')"> Open Popup</a>


I can close the popup with the following link
<a id='clos' name='clos' href='javascript:if (newwindow) newwindow.close()'>Close</a>

I know the id='clos' and name='clos' works because I can reference it with a button and it closes the popup.
<P><input type='button' value='closeIt' onclick=document.getElementById('clos').click();>


I'd like to close it under program control..
My question .. Why doesn't this javascript work?? Far as I know it should be doing the same thing as the button above?
document.getElementById('clos').click();

Thanks for the help..
Dan

[meerkat]

Problem solved.

Instead of trying to create the popup with buttons or href,
I decided to create the popups directly with the following javascript:
var x=popitup('http://google.com');

Thanks for the help..
Dan