Is it possible to select and upload multiple files at one time in Internet Explorer?
IE 7 currently does not (and probably never will) implement the multiple option for file upload input elements which Chrome/FF/Safari/Opera implement. Therefore there is no script/HTML support for receiving multiple files with a single HTML input.
The only option you have for multiple file upload with a single input object is either a Flash-based solution or an Active X control. Alternatively you can create multiple file input elements using javascript.