Javascript authoring tool that can edit multiple files. Editor has color syntax highlighting and always shows line numbers. Many pieces of Javascript and HTML template text may be inserted from menus. All Javascript code is extracted and syntax checked and checked for integration to the surrounding HTML objects. Programmer friendly lists of ascii codes and Javascript code tree to help the developer. Tree dispay of all global variables, functions, HTML named objects and events (eg onclick) to left of editor for information and navigation. Selecting any tree item or error in the error list positions the editor to the appropriate line and highlights it.