//It looks through the document for any “img” or “input” tags with a class of “ro”. 
//The rollover image needs to be named the same as the normal image but with “_o” at the end. 
//For example, the rollover image for “image.gif” will be “image_o.gif”. 
//After finding all the image tags, the script preloads all of the rollover images and ads the “mouseover” and “mouseout” events.
	//<img src="image3.gif" class="ro" />
	//<input type="image" src="image1.gif" class="ro" />

$(document).ready( function(){
   PEPS.rollover.init();
});

PEPS = {};

PEPS.rollover = 
{
   init: function()
   {
      this.preload();
      
      $(".ro").hover(
         function () { $(this).attr( 'src', PEPS.rollover.newimage($(this).attr('src')) ); }, 
         function () { $(this).attr( 'src', PEPS.rollover.oldimage($(this).attr('src')) ); }
      );
   },

   preload: function()
   {
      $(window).bind('load', function() {
         $('.ro').each( function( key, elm ) { $('<img>').attr( 'src', PEPS.rollover.newimage( $(this).attr('src') ) ); });
      });
   },
   
   newimage: function( src )
   { 
      return src.substring( 0, src.search(/(\.[a-z]+)$/) ) + '_o' + src.match(/(\.[a-z]+)$/)[0]; 
   },

   oldimage: function( src )
   { 
      return src.replace(/_o\./, '.'); 
   }
};