I have an image web that uses TinyMCE to provide info about each image. I need to use the tinyMCE image plugin to upload pictures to the text area. I have followed the documentation but seems that the image gets uploaded but then I get a 403 error. Below is the code for the image plugin. One thing I can't find any answer to is what 'my browser value' is.

image_uploadtab: true,
images_upload_url: 'postacceptor.php',
file_browser_callback: function(field_name, url, type, win) {
win.document.getElementById(field_name).value = 'my browser value';`