/*
* Copyright (C) 2009 Joel Sutherland
* Licenced under the MIT license
* http://www.newmediacampaigns.com/
*/

(function($){
	$.fn.autosprites=function(settings){
		settings=$.extend({
			offset:'100%',orientation:'horizontal',over:{
			opacity:'show'
			},
			overSpeed:275,out:{opacity:'hide'
			},
			outSpeed:525,activeState:false,activeClass:'active',activeSprites:false
			},
			settings);
			function rempx(string){return Number(string.substr(0,string.length-2));
			}
function addpx(number){
	return number+'px';
	}
$(this).each(function(){
	var backgroundImage=$(this).css('background-image');$(this).css('zIndex',100).find('a').css('zIndex',99);
	var totalPositionOffset=0;$(this).children().each(function(){
		var positionOffset='-'+addpx(totalPositionOffset);
		var baseOffset='0px';
		if(settings.activeState&&$(this).hasClass(settings.activeClass)){
			baseOffset='-'+addpx(rempx(settings.offset));
			if(settings.activeSprites)
baseOffset='-'+addpx(rempx(settings.offset)*2);
}
var position=settings.orientation=='horizontal'?positionOffset+' '+baseOffset:baseOffset+' '+positionOffset;
var offsetPosition=settings.orientation=='horizontal'?positionOffset+' -'+settings.offset:'-'+settings.offset+' '+positionOffset;$(this).css({
	backgroundImage:backgroundImage,backgroundPosition:position
	});
	var width=$(this).css('width');
	var height=$(this).css('height');
	var hover=$('<div>&nbsp;</div>').css({
		cursor:'hand',zIndex:1,position:'absolute',top:0,left:0,width:width,height:height,backgroundImage:backgroundImage,backgroundPosition:offsetPosition
		}).hide();$(this).prepend(hover);$(this).hover(function(){$(this).find('div').stop(false,true).animate(settings.over,settings.overSpeed);
		},
		function(){$(this).find('div').stop(false,true).animate(settings.out,settings.outSpeed);
		});
		totalPositionOffset+=settings.orientation=='horizontal'?rempx(width):rempx(height);});});}})(jQuery);