var simpleGallery_navpanel={
	panel: {height:'45px', opacity:0.8, paddingTop:'5px', fontStyle:'11px Arial'}, //customize nav panel container
	slideduration: 500 //duration of slide up animation to reveal panel
}



function simpleGallery(settingarg){

	this.setting=settingarg

	settingarg=null

	var setting=this.setting

	setting.panelheight=(parseInt(setting.navpanelheight)>5)? parseInt(setting.navpanelheight) : parseInt(simpleGallery_navpanel.panel.height)

	setting.fadeduration=parseInt(setting.fadeduration)

	setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 0

	setting.curimage=setting.curimage || 0 //account for curimage being null if cookie is empty

	setting.ispaused=!setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play

	setting.currentstep=0 //keep track of # of slides slideshow has gone through

	setting.totalsteps=setting.imagearray.length*setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles

	setting.fglayer=0, setting.bglayer=1 //index of active and background layer (switches after each change of slide)

	setting.oninit=setting.oninit || function(){}

	setting.onslide=setting.onslide || function(){}

	var preloadimages=[], longestdesc=null //preload images

	setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""

	for (var i=0; i<setting.imagearray.length; i++){

		preloadimages[i]=new Image()

		preloadimages[i].src=setting.imagearray[i][0]

		if (setting.imagearray[i][3] && setting.imagearray[i][3].length>setting.longestdesc.length)

			setting.longestdesc=setting.imagearray[i][3]

	}

	var slideshow=this

	jQuery(document).ready(function($){

		var setting=slideshow.setting

		setting.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', background:'black', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}).empty() //main gallery DIV

		if (setting.$wrapperdiv.length==0){ //if no wrapper DIV found

			alert("Error: DIV with ID \""+setting.wrapperid+"\" not found on page.")

			return

		}

		setting.$gallerylayers=$('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 

			.css({position:'absolute', left:0, top:0})

			.appendTo(setting.$wrapperdiv)

		setting.gallerylayers=setting.$gallerylayers.get() //cache stacked DIVs as DOM objects

		setting.navbuttons=simpleGallery.routines.addnavpanel(setting) //get 4 nav buttons DIVs as DOM objects

		$(setting.navbuttons).filter('img.navimages').css({opacity:0.8})

			.bind('mouseover mouseout', function(e){

				$(this).css({opacity:(e.type=="mouseover")? 1 : 0.8})

			})

			.bind('click', function(e){

				var keyword=e.target.title.toLowerCase()

				slideshow.navigate(keyword) //assign behavior to nav images

			})

		setting.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show')})

		setting.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide')})

		slideshow.showslide(setting.curimage) //show initial slide

		setting.oninit.call(slideshow) //trigger oninit() event

		$(window).bind('unload', function(){ //clean up and persist

			$(slideshow.setting.navbuttons).unbind()

			if (slideshow.setting.persist) //remember last shown image's index

				simpleGallery.routines.setCookie("gallery-"+setting.wrapperid, setting.curimage)

			jQuery.each(slideshow.setting, function(k){

				if (slideshow.setting[k] instanceof Array){

					for (var i=0; i<slideshow.setting[k].length; i++){

						if (slideshow.setting[k][i].tagName=="DIV") //catches 2 gallerylayer divs, status div

							slideshow.setting[k][i].innerHTML=null

						slideshow.setting[k][i]=null

					}

				}

				if (slideshow.setting[k].innerHTML) //catch content text div

					slideshow.setting[k].innerHTML=null

				slideshow.setting[k]=null

			})

			slideshow=slideshow.setting=null

		})

	})

}



simpleGallery.prototype={



	navigate:function(keyword){

		clearTimeout(this.setting.playtimer)

		this.setting.totalsteps=100000 //if any of the nav buttons are clicked on, set totalsteps limit to an "unreachable" number 

		if (!isNaN(parseInt(keyword))){

			this.showslide(parseInt(keyword))

		}

		else if (/(prev)|(next)/i.test(keyword)){

			this.showslide(keyword.toLowerCase())

		}

	},



	showslide:function(keyword){

		var slideshow=this

		var setting=slideshow.setting

		var totalimages=setting.imagearray.length

		var imgindex=(keyword=="next")? (setting.curimage<totalimages-1? setting.curimage+1 : 0)

			: (keyword=="prev")? (setting.curimage>0? setting.curimage-1 : totalimages-1)

			: Math.min(keyword, totalimages-1)

		setting.gallerylayers[setting.bglayer].innerHTML=simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex])

		setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}) //background layer becomes foreground

			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:

				clearTimeout(setting.playtimer)

				setting.gallerylayers[setting.bglayer].innerHTML=null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)

				try{

					setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)

				}catch(e){

					alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)

				}

				setting.currentstep+=1

				if (setting.autoplay[0]){

					if (setting.currentstep<=setting.totalsteps)

						setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1])

					else

						slideshow.navigate("play/pause")

				}

			}) //end callback function

		setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background

		setting.fglayer=setting.bglayer

		setting.bglayer=(setting.bglayer==0)? 1 : 0

		setting.curimage=imgindex

		if(setting.shownav){

			setting.navbuttons[2].innerHTML=(setting.curimage+1) + ' von ' + setting.imagearray.length

		}

		setting.navbuttons[3].innerHTML=setting.imagearray[imgindex][3]

	},



	showhidenavpanel:function(state){

		var setting=this.setting

		var endpoint=(state=="show")? setting.dimensions[1]-setting.panelheight : this.setting.dimensions[1]

		setting.$navpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration)

	}

}



simpleGallery.routines={



	getSlideHTML:function(imgelement){

		var layerHTML=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '' //hyperlink slide?

		layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />'

		layerHTML+=(imgelement[1])? '</a>' : ''

		return layerHTML //return HTML for this layer

	},



	addnavpanel:function(setting){

		var imgstyle='position:relative; border:0; cursor:hand; cursor:pointer;'

		var interfaceHTML=''

		if (setting.shownav) {

			interfaceHTML+='<div class="content" style="float:left;text-align:left;margin:5px 8px;height:30px;overflow:hidden"></div><div class="nav"><img class="navimages" title="Prev" src="' + gfxlocation + '/gfx/left.png" style="'+imgstyle+'" /><div class="status" style="display:inline;position:relative;">' + (setting.curimage+1) + ' von ' + setting.imagearray.length + '</div><img class="navimages" title="Next" src="' + gfxlocation + '/gfx/right.png" style="'+imgstyle+'" /></div><div style="clear:both;">&nbsp;</div>'

		} else {

			interfaceHTML+='<div class="content" style="float:left;text-align:left;margin:5px 8px;height:25px;overflow:hidden;width:' + (setting.dimensions[0]-10) + 'px"></div>'

		}

		setting.$navpanel=$('<div class="info"></div>')

			.css({position:'absolute', width:'100%', height:setting.panelheight, left:0, top:setting.dimensions[1], font:simpleGallery_navpanel.panel.fontStyle, zIndex:'1001'})

			.appendTo(setting.$wrapperdiv)

		$('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs

			.css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})

			.eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"navpanelbg" div

			.eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, textAlign:'center', color:'white'}).html(interfaceHTML).end() //"navpanelfg" div

			.appendTo(setting.$navpanel)

		return setting.$navpanel.find('img.navimages, div.status, div.content').get() //return 2 nav related images and DIVs as DOM objects

	},



	getCookie:function(Name){ 

		var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair

		if (document.cookie.match(re)) //if cookie found

			return document.cookie.match(re)[0].split("=")[1] //return its value

		return null

	},



	setCookie:function(name, value){

		document.cookie = name+"=" + value + ";path=/"

	}

}