Upload file types limit

Hello, we would like to limit the file uploads to only image files, how can we go about doing this?

If this can’t be done we would alternatively want to change the upload path to something less generic and change the file names to have alpha numeric value strapped to the file name.
How can we go about doing this?

Here's some sample code to limit file uploads to images:
http://formidablepro.com/help-desk/restrict-filetypes-per-field/

You can remove the lines dealing with file size if you would like.
if ((int)$_FILES['file'.$field->id]['size'] > 100000){ //change this number to the max size you would like

        $errors['field'.$field->id] = 'That file is too big. Please upload another.';

        }

This post includes sample code to add additional folders inside the uploads/formidable folder (or wherever your uploads are currently going) for organizing uploads:
http://formidablepro.com/help-desk/send-uploaded-image-to-a-specific-created-folder-under-wp-content/

The answer to your file naming question can be found using Google since Formidable uses the regular WordPress upload process. Another user also posted an example:http://formidablepro.com/help-desk/how-can-each-file-upload-generate-thumbs-that-accordingly-to-its-theme-add_image_size/#frm_topic_18090

Topic closed.