Addthis.com button for individual post window size

Hi, I’m trying to use the Blog Post Button from Addthis.com an I’m having trouble trying to figure out how I can get a resized new window once you click on an Addthis button for an individual post. For example, when you click the “Blog Button” from Addthis.com, it will launch a new window that’s resized. The link provided from Addthis uses an OnClick event that resizes the popup to width=620, height=520, etc.

However, the button that they provide for the Blog POST Button, launches a new window (or new tab) and it’s not resized.

The questions is how can I change the link they provide for the Blog POST Button (bookmarking a specific permalink) to behave like the one they have for the BLOG Button (bookmarking the site/blog). Notice that it uses WordPress template tags in order to generate the permalinks and other information.

I’d like to get it to work like on Techcrunch http://www.techcrunch.com/

You can see what I’m seeing by visiting:
http://www.addthis.com/web-button-select.html

Select Blog, WordPress

Any help would be much appreciated. Thank you.