Using Lightbox2 to load Webform loads full page in IE9

Issue Summary

I used lightbox2 to load a webform when users click "Request Info" on this page: http://goo.gl/Bf2Gp. I added "lightframe" property to this link and set a width and height exactly as explained here: http://drupal.org/node/252260. This works perfectly on Chrome (The webform loads as a lightbox). However, when using IE9, it loads as a full webpage, not a lightbox. I changed the setting from "lightframe" to "lightmodal", which seemed to work, however, it takes much longer to load, and disables the javascript features on the webform. I looked around, and haven't been able to find a solution to this problem. Any help is great!

Thanks,
Nadia