For starters, instead of using integers all over the place, I would use a cleaned up version of the browser name (i.e. _description_1 becomes internet_explorer_

For starters, instead of using integers all over the place, I would use a cleaned up version of the browser name (i.e. _description_1 becomes internet_explorer_description, _installLink_1 becomes internet_explorer_download, etc.). If they're using the IDs to do the randomization, that could be moved to class names that could easily be picked up by the javascript (instead of looking for _item_id_1 through _item_id_5, just pick up any div with a class of "first-tier" and randomize those). Perhaps I'm being pedantic, but it seems like it would be easier to maintain (which for a single page site, might not really be an issue).