rollover: Basic rollover images

===== BASIC DOCUMENTATION FOR rollover class =====

0.- INTRODUCTION

  The class handles generation of a rollover image (that means an image that
  changes whenever the mouse is over it or not).  Javascript interface is based
  on old dynlayer api and works well on all 3 major browsers (IE 5.x, NS 4.x, NS 5+)
  and has been tested up to 1 layer depth (i.e. <div ....><img ...></div>) but will possibly
  fail on a more intrincated layer structure (almost for sure... at least on NS browsers)

1.- INTERFACE

  The public interface for the class is formed by:

  rollover($dirapp,$layer,$imgname,$baseimg,$selimg,$alt="",$link="#")
	
    CONSTRUCTOR: initializes all data

	$dirapp -> root directory for the web to path generation operations
	$layer -> name for the layer where the img is places
	$imgname -> name for the image (<img name='XXXX'...)
	$baseimg -> src for the not selected image
	$selimg ->src for the selected image
	$alt -> alt text for the image
	$link -> where to link from the image (as onMouseOver/Out is on an <a> element


  preload()

    PRELOADER: Generates the extra img objects used by the JavaScript
	
	NOTE: must be called within an existing <script> tag

  image()  

    GENERATOR: puts the image and the event handling on screen


  The Javascript interface works in 2 functions (placed in the images.js file)
  that must be included in the page (i.e. <script language=javascript src=images.js></script>)

  preload(imgobj,srcimg)

	imgobj -> string: name for the img object
	srcimg -> string: path & filename for the image to preload

  changeImage(layer,image,imgobj)

	layer -> string: name for the layer where the img is placed
	image -> string: name for the image that does 'roll'
	imgobj-> string: name for the imgobject with the new image


2.- Future releases and WIP

  This class will not have many revisions as it is fully functional for
  it's intended use.  For further developement any suggestions appreciated

3.- Contact information

  Carlos Falo Hervás
  carles@bisinteractive.net
  http://www.bisinteractive.net

  C/Manila 54-56 Esc. A Ent. 4ª
  08034 Barcelona Spain

  Phone: +34 9 3 2063652
  Fax:	 +34 9 3 2063689