This page needs to install the MapViewer ActiveX component from Mindjet in order to function. You may need to tweak your security settings. Visit the mindjet site for more info.
Firefox Users: Unfortuntely the ActiveX viewer only works on IE. If you have IE on your system, you can paste the text in the address bar above to IE
Another option is to install the Firefox IE tab add-in. This add-in allows you to have an IE tab (and thus working ActiveX) within FireFox. If you have IETab installed, click right on the page and choose "View in IETab"