1. A method of defining customization for electronic visual content retrieved over an electronic connection, comprising: retrieving electronic visual content from a remote server to a local client, through an intermediary apparatus; locally editing the electronic visual content at the local client by a user using a WYSIWYG editor, wherein said editor is a standard software used for displaying of content and wherein said editing does not require installation of software requiring user authorization and does not change content stored in said remote server; detecting changes in said electronic visual content caused by said editing, after said editing is performed; automatically generating at least one customization definition based on said changes, said customization definition suitable for automatic applying to said electronic visual content; and modifying by said intermediary apparatus data provided at a later time according to the at least one customization definition for a visual presentation thereof at a plurality of local clients to a plurality of end users; wherein the intermediary apparatus supports the editing of said electronic visual content at the local client.
49. A method according to claim 1 , wherein the detecting changes is performed by said intermediary apparatus.