I use
BlueFish http://bluefish.openoffice.nl/
It is a great html/text editor for Linux. Very configurable and has a great tabbed interface for multiple page display. A few of it's features include:
# Multiple document interface, easily opens 500+ documents (tested 3500 documents simultaneously)
# Customizable syntax highlighting based on Perl Compatible regular expressions, with subpattern support and default patterns for
* PHP
* HTML
* C
* Java
* XML
* Python
* ColdFusion
* Pascal
* R
# Anti aliased text window
# Multiple encodings support, can convert between different character sets, supports multibyte characters, unicode, UTF8 etc.
# Nice wizards for startup, tables, frames, and others
# Dialogs for many HTML tags, with all their attributes
# HTML toolbar and tearable menu's
# Compliance with the Gnome and KDE user interface guidelines where possible
# User-customizable toolbar for quick access to often used functions
# Open files based on filename patterns and/or content
# Fully featured image insert dialog
# Thumbnail creation and automatically linking of the thumbnail with the original image
# Multi thumbnail generation for easy creation of photo albums or screenshot pages
# Line numbers along the document
# A custom menu, specify your own tags or sets of code, and define your own dialogs
# Custom search and replace pattern support for the Custom menu
# Very powerful search and replace, allowing POSIX and Perl Compatible regular expressions and sub-pattern replacing
# Excellent undo/redo functionality
# Function reference browser, including reference files for PHP and HTML
# Configurable recent documents and recent directories functionality
# Translations in da fr es it ja hu pl no ru sv and de
# User customizable integration of many programs, including weblint, tidy, make, javac etc. etc.
For image maps, I use the gimp under linux. Works great.