This option enables you to have a external list of images this list of images can be generated by a server side page and then inserted into the image dialog windows of TinyMCE. The images can be to internal site images or external URLs.
Example of usage of the external_image_list_url option:
tinyMCE.init({
...
external_image_list_url : "myexternallist.js"
});
Example of a external link list file: (myexternallist.js)
var tinyMCEImageList = new Array(
// Name, URL
["Logo 1", "logo.jpg"],
["Logo 2 Over", "logo_over.jpg"]
);