how to filter the file extensions in the file upload type?

hi all,
how to filter the file extensions in the file upload type? i've used "accept" attribute of the input element as accept="image/jpeg,image/gif". but no use......
i want to upload image files to the server. how to implement this?help me......

Just because a browser "supports" a tag, does not mean that it actually uses it. Here is a web page that indicates that current browsers support the "accept" tag, but don't do anything with it because they don't have to - http://www.webdevout.net/browser-support-html

If you want to check file extensions, you can do this using javascript before the form uploads the file. Here is a link I found through searching the Internet - http://willmaster.com/blog/javascript/prevent_upload_illegal_file_extensions.html

thanx frnd,
it is working. but i need, value of the file type should be cleared when user chooses wrong file(other than images)..