var stepcarousel={
	ajaxloadingmsg: '<div style="margin: 1em; font-weight: bold"><img src="ajaxloadr.gif" style="vertical-align: middle" /> Fetching Content. Please wait...</div>', 
	defaultbuttonsfade: 0.4, 
	configholder: {},
	getCSSValue:function(val){ 
		return (val=="auto")? 0 : parseInt(val)
	},
	getremotepanels:function($, config){ 
		config.$belt.html(this.ajaxloadingmsg)
		$.ajax({
			url: config.contenttype[1], 
			async: true,
			error:function(ajaxrequest){
				config.$belt.html('Error fetching content.<br />Server Response: '+ajaxrequest.responseText)
			},
			success:function(content){
				config.$belt.html(content)
				config.$panels=config.$gallery.find('.'+config.panelclass)
				stepcarousel.alignpanels($, config)
			}
		})
	},
	getoffset:function(what, offsettype){
	
	if (typeof(what.offsetParent) == 'object') {
		return (what.offsetParent)? what[offsettype]+this.getoffset(what.offsetParent, offsettype) : what[offsettype]
		}
	},
	getCookie:function(Name){ 
		var re=new RegExp(Name+"=[^;]+", "i"); 
		if (document.cookie.match(re)) 
			return document.cookie.match(re)[0].split("=")[1] 
		return null
	},
	setCookie:function(name, value){
		document.cookie = name+"="+value
	},
	fadebuttons:function(config, currentpanel){
		config.$leftnavbutton.fadeTo('fast', currentpanel==0? this.defaultbuttonsfade : 1)
		config.$rightnavbutton.fadeTo('fast', currentpanel==config.lastvisiblepanel? this.defaultbuttonsfade : 1)
	},
	addnavbuttons:function(config, currentpanel){
		config.$leftnavbutton=$('<img src="'+config.defaultbuttons.leftnav[0]+'">').css({zIndex:50, position:'absolute', left:config.offsets.left+config.defaultbuttons.leftnav[1]+'px', top:config.offsets.top+config.defaultbuttons.leftnav[2]+'px', cursor:'hand', cursor:'pointer'}).attr({title:'Back '+config.defaultbuttons.moveby+' panels'}).appendTo('body')
		config.$rightnavbutton=$('<img src="'+config.defaultbuttons.rightnav[0]+'">').css({zIndex:50, position:'absolute', left:config.offsets.left+config.$gallery.get(0).offsetWidth+config.defaultbuttons.rightnav[1]+'px', top:config.offsets.top+config.defaultbuttons.rightnav[2]+'px', cursor:'hand', cursor:'pointer'}).attr({title:'Forward '+config.defaultbuttons.moveby+' panels'}).appendTo('body')
		config.$leftnavbutton.bind('click', function(){ 
			stepcarousel.stepBy(config.galleryid, -config.defaultbuttons.moveby)
		})
		config.$rightnavbutton.bind('click', function(){ 
			stepcarousel.stepBy(config.galleryid, config.defaultbuttons.moveby)
		})
		if (config.panelbehavior.wraparound==false){ 
			this.fadebuttons(config, currentpanel)
		}
		return config.$leftnavbutton.add(config.$rightnavbutton)
	},
	stopautostep:function(config){
		clearTimeout(config.steptimer)
		clearTimeout(config.resumeautostep)
	},
	alignpanels:function($, config){
		var paneloffset=0
		config.paneloffsets=[paneloffset] 
		config.panelwidths=[] 
		config.$panels.each(function(index){ 
			var $currentpanel=$(this)
			$currentpanel.css({float: 'none', position: 'absolute', left: paneloffset+'px'}) 
			$currentpanel.bind('click', function(e){return config.onpanelclick(e.target)})
			paneloffset+=stepcarousel.getCSSValue($currentpanel.css('marginRight')) + parseInt($currentpanel.get(0).offsetWidth || $currentpanel.css('width')) 
			config.paneloffsets.push(paneloffset) 
			config.panelwidths.push(paneloffset-config.paneloffsets[config.paneloffsets.length-2]) 
		})
		config.paneloffsets.pop() 
		var addpanelwidths=0
		var lastpanelindex=config.$panels.length-1
		config.lastvisiblepanel=lastpanelindex
		for (var i=config.$panels.length-1; i>=0; i--){
			addpanelwidths+=(i==lastpanelindex? config.panelwidths[lastpanelindex] : config.paneloffsets[i+1]-config.paneloffsets[i])
			if (config.gallerywidth>addpanelwidths){
				config.lastvisiblepanel=i 
			}
		}
		config.$belt.css({width: paneloffset+'px'}) 
		config.currentpanel=(config.panelbehavior.persist)? parseInt(this.getCookie(window[config.galleryid+"persist"])) : 0 //determine 1st panel to show by default
		config.currentpanel=(typeof config.currentpanel=="number" && config.currentpanel<config.$panels.length)? config.currentpanel : 0
		if (config.currentpanel!=0){
			var endpoint=config.paneloffsets[config.currentpanel]+(config.currentpanel==0? 0 : config.beltoffset)
			config.$belt.css({left: -endpoint+'px'})
		}
		if(config.defaultbuttons != null){
		if (config.defaultbuttons.enable==true){ 
			var $navbuttons=this.addnavbuttons(config, config.currentpanel)
			$(window).bind("load resize", function(){ 
				config.offsets={left:stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"), top:stepcarousel.getoffset(config.$gallery.get(0), "offsetTop")}
				config.$leftnavbutton.css({left:config.offsets.left+config.defaultbuttons.leftnav[1]+'px', top:config.offsets.top+config.defaultbuttons.leftnav[2]+'px'})
				config.$rightnavbutton.css({left:config.offsets.left+config.$gallery.get(0).offsetWidth+config.defaultbuttons.rightnav[1]+'px', top:config.offsets.top+config.defaultbuttons.rightnav[2]+'px'})
			})
		}
		}
		if (config.autostep && config.autostep.enable){ 
			var $carouselparts=config.$gallery.add(typeof $navbuttons!="undefined"? $navbuttons : null)
			$carouselparts.bind('click', function(){
				stepcarousel.stopautostep(config)
				config.autostep.status="stopped"
			})
			$carouselparts.hover(function(){ 
				stepcarousel.stopautostep(config)
				config.autostep.hoverstate="over"
			}, function(){ 
				if (config.steptimer && config.autostep.hoverstate=="over" && config.autostep.status!="stopped"){
					config.resumeautostep=setTimeout(function(){
						stepcarousel.autorotate(config.galleryid)
						config.autostep.hoverstate="out"
					}, 500)
				}
			})
			config.steptimer=setTimeout(function(){stepcarousel.autorotate(config.galleryid)}, config.autostep.pause) 
		} 
		this.statusreport(config.galleryid)
		config.oninit()
		config.onslideaction(this)
	},
	stepTo:function(galleryid, pindex){ 
		var config=stepcarousel.configholder[galleryid]
		if (typeof config=="undefined"){
			alert("There's an error with your set up of Carousel Viewer \""+galleryid+ "\"!")
			return
		}
		stepcarousel.stopautostep(config)
		var pindex=Math.min(pindex-1, config.paneloffsets.length-1)
		var endpoint=config.paneloffsets[pindex]+(pindex==0? 0 : config.beltoffset)
		if (config.panelbehavior.wraparound==false && config.defaultbuttons.enable==true){ 
			this.fadebuttons(config, pindex)
		}
		config.$belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this)})
		config.currentpanel=pindex
		this.statusreport(galleryid)
	},
	stepBy:function(galleryid, steps){ 
		var config=stepcarousel.configholder[galleryid]
		if (typeof config=="undefined"){
			alert("There's an error with your set up of Carousel Viewer \""+galleryid+ "\"!")
			return
		}
		stepcarousel.stopautostep(config)
		var direction=(steps>0)? 'forward' : 'back' 
		var pindex=config.currentpanel+steps 
		if (config.panelbehavior.wraparound==false){ 
			pindex=(direction=="back" && pindex<=0)? 0 : (direction=="forward")? Math.min(pindex, config.lastvisiblepanel) : pindex
			if (config.defaultbuttons.enable==true){ 
				stepcarousel.fadebuttons(config, pindex)
			}	
		}else{ 
			if (pindex>config.lastvisiblepanel && direction=="forward"){
				pindex=(config.currentpanel<config.lastvisiblepanel)? config.lastvisiblepanel : 0
			}
			else if (pindex<0 && direction=="back"){
				pindex=(config.currentpanel>0)? 0 : config.lastvisiblepanel /*wrap around left*/
			}
		}
		var endpoint=config.paneloffsets[pindex]+(pindex==0? 0 : config.beltoffset) 
		if (pindex==0 && direction=='forward' || config.currentpanel==0 && direction=='back' && config.panelbehavior.wraparound==true){ 
			config.$belt.animate({left: -config.paneloffsets[config.currentpanel]-(direction=='forward'? 100 : -30)+'px'}, 'normal', function(){
				config.$belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this)})
			})
		}else
			config.$belt.animate({left: -endpoint+'px'}, config.panelbehavior.speed, function(){config.onslideaction(this)})
		config.currentpanel=pindex
		this.statusreport(galleryid)
	},

	autorotate:function(galleryid){
		var config=stepcarousel.configholder[galleryid]
		if (config.$gallery.attr('_ismouseover')!="yes"){
			this.stepBy(galleryid, config.autostep.moveby)
		}
		config.steptimer=setTimeout(function(){stepcarousel.autorotate(galleryid)}, config.autostep.pause)
	},
	statusreport:function(galleryid){
		var config=stepcarousel.configholder[galleryid]
		var startpoint=config.currentpanel 
		var visiblewidth=0
		for (var endpoint=startpoint; endpoint<config.paneloffsets.length; endpoint++){ 
			visiblewidth+=config.panelwidths[endpoint]
			if (visiblewidth>config.gallerywidth){
				break
			}
		}
		startpoint+=1 
		endpoint=(endpoint+1==startpoint)? startpoint : endpoint 
		var valuearray=[startpoint, endpoint, config.panelwidths.length]
		for (var i=0; i<config.statusvars.length; i++){
			window[config.statusvars[i]]=valuearray[i] 
			config.$statusobjs[i].text(valuearray[i]+" ") 
		}
	},
	setup:function(config){
		document.write('<style type="text/css">\n#'+config.galleryid+'{overflow: hidden;}\n</style>')
		jQuery(document).ready(function($){
			config.$gallery=$('#'+config.galleryid)
			config.gallerywidth=config.$gallery.width()
			config.offsets={left:stepcarousel.getoffset(config.$gallery.get(0), "offsetLeft"), top:stepcarousel.getoffset(config.$gallery.get(0), "offsetTop")}
			config.$belt=config.$gallery.find('.'+config.beltclass) 
			config.$panels=config.$gallery.find('.'+config.panelclass) 
			config.panelbehavior.wraparound=(config.autostep && config.autostep.enable)? true : config.panelbehavior.wraparound
			config.onpanelclick=(typeof config.onpanelclick=="undefined")? function(target){} : config.onpanelclick 
			config.onslideaction=(typeof config.onslide=="undefined")? function(){} : function(beltobj){$(beltobj).stop(); config.onslide()} 
			config.oninit=(typeof config.oninit=="undefined")? function(){} : config.oninit 
			config.beltoffset=stepcarousel.getCSSValue(config.$belt.css('marginLeft')) 
			config.statusvars=config.statusvars || []  
			config.$statusobjs=[$('#'+config.statusvars[0]), $('#'+config.statusvars[1]), $('#'+config.statusvars[2])]
			config.currentpanel=0
			stepcarousel.configholder[config.galleryid]=config 
			if (config.contenttype[0]=="ajax" && typeof config.contenttype[1]!="undefined") 
				stepcarousel.getremotepanels($, config)
			else
				stepcarousel.alignpanels($, config) 
		}) 
		jQuery(window).bind('unload', function(){
			if (config.panelbehavior.persist){
				stepcarousel.setCookie(window[config.galleryid+"persist"], config.currentpanel)
			}
			jQuery.each(config, function(ai, oi){
				oi=null
			})
			config=null
		})
	}
}