Hello, I would like to open another site/url/html inside a ShowBox but I can't figure out how to do it.

On the page in question (in this case a test site) I created a page called "link" where I put a picture of a window, I linked that window to an external website "https://us.yahoo.com/" and in the options I set it to open in a ShowBox but when I click on the pic all I get is a blank ShowBox.

http://fogpit.com/link.html

Thanks in advance.