I saw this javascript library in the code for the Mozilla Support page (really well done). It looks like it adds HTML5 functionality to older versions of IE. Looks like it should be really useful in the future.
$continue = strtolower(end($name)) == 'zip' ? true : false; if(!$continue) { $message = "The file you are trying to upload is not a .zip file. Please try again."; } else { $message = "File Is .zip"; } }