I'm getting an error with WP-reCAPTCHA and Slimbox with Internet Explorer 6. IE 7 seems to be ok. I'm using reCAPTCHA v2.9.1 for comments and Slimbox v1.2. Each plugin works fine by itself but they don't work together. All other plugins are disabled now. The first time the page loads everything is ok. If you reload the page a dialog box pops up saying
Internet Explorer cannot open the Internet site http://orrmarshall.com/wp/2008/07/08/wordpress-testing/.
After a quick Google search I see that this is a common problem with IE 6 but I don't know why or how these two plugins would cause this problem. My best guess is it's this bug:
And it may be related to this Mootools problem: