// ---
/*
	JaS is developed by Robert Nyman, http://www.robertnyman.com
	For more information, please see http://www.robertnyman.com/jas
*/
var JaS = {
	// Customization parameters
	imagePath : "/tour/pictures/help/",
	images : [
		["marcie.jpg", "We really mean it when we say we want to see you succeed. Our faculty and staff are ready to assist you in achieving your academic and personal goals.", ""],
		["group.jpg", "Our academic support staff is here to help you through the numerous changes you’ll experience. We’ll help you make a smooth and successful transition to your new environment so you can quickly ‘hit your stride’ at FSC.", ""],
		["faculty.jpg", "At FSC, faculty are not only dedicated teachers but also generous and giving friends, ready to provide support and encouragement, and coaching you in areas where you are unsure.  ", ""],
		["ssc.jpg", "The Student Solutions Center is our one-stop resource where you can ask questions and take care of your registration, financial, and advising needs. Our staffers are trained to make sure you always have the information you need to keep your college career on track.", ""],
		["career2.jpg", "Whether you plan to attend graduate school or proceed directly into the workplace, the Career Center is here to help you through all the various stages of the career exploration and planning process.  Together, we will help you define your career goals and help you take the steps necessary to achieve them. ", ""],
		["health.jpg", "FSC’s Health Center staff is responsible for the health and well- being of every student. Registered Nurses are available to assist you should illness or injury occur.", ""],
		["career.jpg", "Whether you’re making an important decision, resolving a personal issue, or working through relationship difficulties, our personal counseling center will help you maintain your emotional well-being in order to achieve your educational goals.", ""],
		["wurtz.jpg", "If you want a place where you’ll really be cared about as a person—choose FSC.", ""]

	],
	fadeContainerId : "jas-container",
	imageContainerId : "jas-image",
	imageTextContainerId : "jas-image-text",
	previousLinkId : "previous-image",
	nextLinkId : "next-image",
	imageCounterId : "image-counter",
	startSlideShowId : "start-slideshow",
	stopSlideShowId : "stop-slideshow",	
	dimBackgroundOverlayId : "jas-dim-overlay",
	dimBackgroundId : "dim-background",
	noDimBackgroundId : "no-dim-background",
	thumbnailContainerId: "jas-thumbnails",
	tagsContainerId: "jas-tags",
	tagsSelectAllId: "jas-select-all-tags",
	useImageText : true,
	useThumbnails : true,
	allowDimmedBackground : true,
	automaticallyDimBackgroundWhenSlideShow : true,
	useTags : true,
	useKeyboardShortcuts : true,	
	useFadingIn : true,
	useFadingOut : true,
	useFadeWhenNotSlideshow : false,
	useFadeForSlideshow : true,
	useFadeAtInitialLoad : false,
	fadeIncrement : 0.1,	
	fadeInterval : 100, // Milliseconds	
	timeForSlideInSlideshow : 1500, // Milliseconds	
	
	// JaS function parameters
	allImages : null,
	currentImages : null,
	fadeContainer : null,
	imageContainer : null,
	imageTextContainer : null,
	previousLink : null,
	nextLink : null,
	dimBackgroundOverlay : null,
	dimBackgroundLink : null,
	noDimBackgroundLink : null,
	dimmingActivated : false,
	imageCounter : null,
	startSlideShowLink : null,
	stopSlideShowLink : null,
	thumbnailContainer : null,
	thumbnailCollection : [],
	currentThumbnailSelected : null,
	tagsContainer : null,
	tagsSelectAll : null,
	tagsList : null,
	tags : [],
	tagsCheckboxes : [],
	selectAllTags : true,
	imageText : null,
	imageText : "",
	imageSource : "",
	imageIndex : 0,
	fadingIn : true,
	fadeLevel : 0,
	fadeEndLevel : 1,
	fadeTimer : null,
	hasOpacitySupport : false,
	useMSFilter : false,
	useMSCurrentStyle : false,
	slideshowIsSupported : false,
	slideshowIsPlaying : false,
	functionAfterFade : null,
	isInitialLoad : false,
	
	init : function (){
    	if($){
			this.fadeContainer = $(this.fadeContainerId);
			this.imageContainer = $(this.imageContainerId);
			this.slideshowIsSupported = this.fadeContainer && this.imageContainer;
			if(this.slideshowIsSupported){
				this.allImages = this.images;
				this.currentImages = this.images;
				if(this.useImageText){
					this.imageTextContainer = $(this.imageTextContainerId);
					if(!this.imageTextContainer){
						this.useImageText = false;
					}
				}
				this.hasOpacitySupport = typeof this.fadeContainer.style.filter != "undefined" || typeof this.fadeContainer.style.opacity != "undefined";
				this.useMSFilter = typeof this.fadeContainer.style.filter != "undefined";
				this.useMSCurrentStyle = typeof this.fadeContainer.currentStyle != "undefined";
				
				this.previousLink = $(this.previousLinkId);
				this.previousLink.onclick = JaS.previousLinkClick;
				this.nextLink = $(this.nextLinkId);
				this.nextLink.onclick = JaS.nextLinkClick;
				this.imageCounter = $(this.imageCounterId);
				this.startSlideShowLink = $(this.startSlideShowId);
				if(this.startSlideShowLink){
					this.startSlideShowLink.style.display = "inline";
				}
				this.startSlideShowLink.onclick = JaS.startSlideShowClick;
				this.stopSlideShowLink = $(this.stopSlideShowId);
				if(this.stopSlideShowLink){
					this.stopSlideShowLink.style.display = "none";
				}
				this.stopSlideShowLink.onclick = JaS.stopSlideshowClick;
				
				if(this.allowDimmedBackground){
					this.dimBackgroundOverlay = $(this.dimBackgroundOverlayId);
					this.dimBackgroundLink = $(this.dimBackgroundId);
					this.noDimBackgroundLink = $(this.noDimBackgroundId);
					if(this.dimBackgroundOverlay && this.dimBackgroundLink && this.noDimBackgroundLink){
						this.dimBackgroundLink.onclick = JaS.dimBackgroundClick;
						this.noDimBackgroundLink.onclick = JaS.noDimackgroundClick;
						this.noDimBackgroundLink.style.display = "none";
						this.dimmingActivated = true;
					}
				}
				
				if(this.useKeyboardShortcuts){
					document.onkeydown = JaS.documentKeyDown;
				}
				
				this.thumbnailContainer = $(this.thumbnailContainerId);
				if(this.useThumbnails && this.thumbnailContainer){
					this.createThumbnails();
				}
				
				this.tagsContainer = $(this.tagsContainerId);
				if(this.useTags && this.tagsContainer){
					this.tagsSelectAll = $(this.tagsSelectAllId);
					if(this.tagsSelectAll){
						this.tagsSelectAll.onclick = JaS.tagsSelectAllClick;
						this.createTagList();
					}
				}
				
				this.isInitialLoad = true;
				this.setImage();
				this.isInitialLoad = false;
			}
		}
	},
	
	previousLinkClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.previousImage();
	},
	
	nextLinkClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.nextImage();
	},
	
	startSlideShowClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.startSlideshow();
	},
	
	stopSlideshowClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.stopSlideshow();
	},
	
	dimBackgroundClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.dimBackground();
	},
	
	documentKeyDown : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.applyKeyboardNavigation(oEvent);
	},
	
	tagsSelectAllClick : function (oEvent){
		JaS.tagsSelectAll = this.checked;
		JaS.markAllTags();
	},
	
	noDimackgroundClick : function(oEvent){
		var oEvent = (typeof oEvent != "undefined")? oEvent : event;
		JaS.preventDefaultEventBehavior(oEvent);
		JaS.noDimBackground();
	},
	
	setImage : function (){
		if(this.currentImages.length > 0){
			this.imageContainer.style.visibility = "visible";
			this.imageSource = this.currentImages[this.imageIndex][0];
			this.imageText = this.currentImages[this.imageIndex][1];
			if(this.useFadingOut && (this.slideshowIsPlaying && this.useFadeForSlideshow) || (!this.slideshowIsPlaying && this.useFadeWhenNotSlideshow) && (this.useFadeAtInitialLoad && this.isInitialLoad || !this.isInitialLoad)){
				this.fadeOut();
			}
			else{
				this.displayImageCount();
				this.imageContainer.setAttribute("src", (this.imagePath + this.imageSource));
				this.setImageText();
				this.previousLink.style.visibility = (this.imageIndex > 0)? "visible" : "hidden";
				this.nextLink.style.visibility = (this.imageIndex < (this.currentImages.length - 1))? "visible" : "hidden";
				if((this.useFadeAtInitialLoad && this.isInitialLoad || !this.isInitialLoad) && ((this.slideshowIsPlaying && this.useFadeForSlideshow) || (!this.slideshowIsPlaying && this.useFadeWhenNotSlideshow))){
					this.fadeIn();
				}
			}
			if(this.useThumbnails){
				this.markCurrentThumbnail();
			}
		}
		else{
			this.imageSource = "";
			this.imageText = "";
			this.displayImageCount();
			this.imageContainer.style.visibility = "hidden";
			this.setImageText();
		}
	},
	
	displayImageCount : function (){
    	if(this.imageCounter){
			this.imageCounter.innerHTML = (((this.currentImages.length > 0)? this.imageIndex : -1) + 1) + " / " + this.currentImages.length;
		}
	},
	
	nextImage : function (){
		if(this.imageIndex < (this.currentImages.length - 1)){
			++this.imageIndex;
			this.setImage();
		}
		else if(this.slideshowIsPlaying){
			this.stopSlideshow();
			this.imageIndex = 0;
			this.setImage();
		}
	},
	
	previousImage : function (){
		if(this.imageIndex > 0){
			--this.imageIndex;
			this.setImage();
		}         
	},

	setImageText : function (){
		this.imageTextContainer.setAttribute("alt", this.imageText);
    	if(this.useImageText && typeof this.imageText == "string"){
			this.imageTextContainer.innerHTML = this.imageText;
		}
	},
	
	setDimBackgroundSize : function(){
         var oDimBackground = this.dimBackgroundOverlay.style;
         var intWidth = document.body.offsetWidth;
         var intXScroll = (typeof window.pageXOffset != "undefined")? window.pageXOffset : document.body.scrollLeft;
         var intHeight = (typeof window.innerHeight != "undefined")? window.innerHeight : (document.documentElement)? document.documentElement.clientHeight : document.body.clientHeight;
         var intYScroll = (typeof window.window.pageYOffset != "undefined")? window.window.pageYOffset : (document.documentElement)? document.documentElement.scrollTop : document.documentElement.scrollTop;
         oDimBackground.width = intWidth + intXScroll + "px";
         oDimBackground.height = intHeight + intYScroll + "px";
	},
	
	dimBackground : function (){
         this.setDimBackgroundSize();
         this.dimBackgroundOverlay.style.display = "block";
		 this.noDimBackgroundLink.style.display = "inline";		
	},
	
	noDimBackground : function (fromStopSlideshow){
		this.dimBackgroundOverlay.style.display = "none";
		this.noDimBackgroundLink.style.display = "none";
		if(!fromStopSlideshow){
			this.stopSlideshow();
		}
	},
		
	startSlideshow : function (){
		if(this.currentImages.length > 0){
			this.startSlideShowLink.style.display = "none";
			this.stopSlideShowLink.style.display = "inline";
			this.slideshowIsPlaying = true;
			this.fadeTimer = setTimeout("JaS.nextImage()", JaS.timeForSlideInSlideshow);
			if(this.dimmingActivated  && this.automaticallyDimBackgroundWhenSlideShow){
				this.dimBackground();
			}
		}
	},
	
	stopSlideshow : function (){
		if(this.currentImages.length > 0){
			this.startSlideShowLink.style.display = "inline";
			this.stopSlideShowLink.style.display = "none";
			this.slideshowIsPlaying = false;
			this.setFadeParams(false, 1, 0);
			this.setFade();
			clearTimeout(this.fadeTimer);
			if(this.dimmingActivated && this.automaticallyDimBackgroundWhenSlideShow){
				this.noDimBackground(true);
			}
		}
	},
	
	fadeIn : function (){
		this.setFadeParams(true, 0, 1);
		this.functionAfterFade = null;
		this.fade();
		if(this.slideshowIsPlaying){
			this.functionAfterFade = "this.startSlideshow()";
		}
	},
	
	fadeOut : function (){
		this.setFadeParams(false, 1, 0);
		this.functionAfterFade = "this.fadeOutDone()";
		this.fade();
	},
	
	fadeOutDone : function (){
        this.displayImageCount();
		this.imageContainer.setAttribute("src", (this.imagePath + this.imageSource));
		this.setImageText();
		if(this.useFadingIn){
			this.fadeIn();
		}
		else{
			this.fadeLevel = 1;
			this.setFade();
		}
	},
	
	fade : function (){
		if((this.fadingIn && this.fadeLevel < this.fadeEndLevel) || !this.fadingIn && this.fadeLevel > this.fadeEndLevel){
			this.fadeLevel = (this.fadingIn)? this.fadeLevel + this.fadeIncrement : this.fadeLevel - this.fadeIncrement;
			// This line is b/c of a floating point bug in JavaScript
			this.fadeLevel = Math.round(this.fadeLevel * 10) / 10;
			this.setFade();
			this.fadeTimer = setTimeout("JaS.fade()", this.fadeInterval);
		}
		else{
			clearTimeout(this.fadeTimer);
			if(this.functionAfterFade){
				eval(this.functionAfterFade);
			}
		}
	},
	
	setFade : function (){
		if(this.useMSFilter){
			this.fadeContainer.style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=" + (this.fadeLevel * 100) + ")";
		}
		else{
			this.fadeContainer.style.opacity = this.fadeLevel;
		}
	},
	
	setFadeParams : function (bFadingIn, intStartLevel, intEndLevel){
		this.fadingIn = bFadingIn;
		this.fadeLevel = intStartLevel;
		this.fadeEndLevel = intEndLevel;
	},
	
	createThumbnails : function (){
		this.thumbnailContainer.innerHTML = "";
		this.thumbnailCollection = [];
    	var oThumbnailsList = document.createElement("ul");
		var oListItem;
		var oThumbnail;
		var oCurrentImage;
		for(var i=0; i<this.currentImages.length; i++){
        	oCurrentImage = this.currentImages[i];
			oListItem = document.createElement("li");
			oThumbnail = document.createElement("img");
			oThumbnail.setAttribute("id", ("jas-thumbnail-" + i));
			oThumbnail.setAttribute("src", (this.imagePath + oCurrentImage[0]));
			oThumbnail.setAttribute("alt", oCurrentImage[1]);
			oThumbnail.setAttribute("title", oCurrentImage[1]);
			oThumbnail.onclick = JaS.thumbnailClick;
			this.thumbnailCollection.push(oThumbnail);
			oListItem.appendChild(oThumbnail);
			oThumbnailsList.appendChild(oListItem);			
        }
		this.thumbnailContainer.appendChild(oThumbnailsList);
		if(this.thumbnailCollection.length > 0){
			this.markCurrentThumbnail();
		}
		if(this.slideshowIsPlaying){
			this.stopSlideshow();
		}
	},
	
	thumbnailClick : function (oEvent){
		JaS.imageIndex = parseInt(this.getAttribute("id").replace(/\D*(\d+)$/, "$1"), 10);
		JaS.setImage();
	},
	
	markCurrentThumbnail : function (){
		if(this.currentThumbnailSelected){
	        this.currentThumbnailSelected.className = "";
			// Sometimes, in IE, the image loses its reference to its parent
			if(this.currentThumbnailSelected.parentNode){
				this.currentThumbnailSelected.parentNode.className = "";
			}
		}
		this.currentThumbnailSelected = this.thumbnailCollection[this.imageIndex];
		this.currentThumbnailSelected.className = "selected";
		this.currentThumbnailSelected.parentNode.className = "selected-parent";
	},
	
	createTagList : function (){
		var strCurrentTag;
		var arrCurrentTag;
		var oRegExp;
		for(var i=0; i<this.images.length; i++){
			arrCurrentTag = this.images[i][2].replace(/\s*(,)\s*/,  "$1").split(",");
			for(var j=0; j<arrCurrentTag.length; j++){
            	strCurrentTag = arrCurrentTag[j];
				oRegExp = new RegExp(strCurrentTag, "i");
				if(this.tags.toString().search(oRegExp) == -1){
					this.tags.push(strCurrentTag);
				}
            }
        }
		this.tagsList = document.createElement("ul");
		var oListItem;
		var oTagCheckbox;
		var oLabel;
		for(var k=0; k<this.tags.length; k++){
			oTag = this.tags[k];
			oListItem = document.createElement("li");
			oTagCheckbox = document.createElement("input");
			oTagCheckbox.setAttribute("type", "checkbox");
			oTagCheckbox.setAttribute("id", ("jas-" + oTag));
			oTagCheckbox.setAttribute("value", oTag);
			oTagCheckbox.checked = true;
			oTagCheckbox.onclick = JaS.tagCheckboxClick;
			oLabel = document.createElement("label");
			oLabel.setAttribute("for", ("jas-" + oTag));
			oLabel.innerHTML = oTag;
			this.tagsCheckboxes.push(oTagCheckbox);
			oListItem.appendChild(oTagCheckbox);
			oListItem.appendChild(oLabel);
			this.tagsList.appendChild(oListItem);
		}
		this.tagsContainer.appendChild(this.tagsList);
		// This loop is necessary since IE can only mark checkboxes as checked after they've been added to the document
		for(var l=0; l<this.tagsCheckboxes.length; l++){
			this.tagsCheckboxes[l].checked = true;		
		}
	},
	
	tagCheckboxClick : function (oEvent){
		JaS.applyTagFilter();
	},
	
	applyTagFilter : function (){
		this.currentImages = [];
		var arrCurrentTags = [];
		var oCheckbox;
		for(var i=0; i<this.tagsCheckboxes.length; i++){
        	oCheckbox = this.tagsCheckboxes[i];
			if(oCheckbox.checked){
				arrCurrentTags.push(oCheckbox.value);
			}
        }
		var oRegExp;
		var oImage;
		for(var j=0; j<this.images.length; j++){
        	oImage = this.images[j];
			for(var k=0; k<arrCurrentTags.length; k++){
				oRegExp = new RegExp(arrCurrentTags[k], "i");
				if(oImage[2].search(oRegExp) != -1){
					this.currentImages.push(oImage);
					break;
				}
			}
        }
		
		if(this.useThumbnails){
			this.createThumbnails();
		}
		this.imageIndex = 0;
		this.setImage();
	},
	
	markAllTags : function (){
		for(var i=0; i<this.tagsCheckboxes.length; i++){
			this.tagsCheckboxes[i].checked = this.tagsSelectAll;
        }
		this.applyTagFilter();
	},
	
	closeSession : function (oEvent){
		JaS = null;
		delete JaS;
	},
	
	applyKeyboardNavigation : function (oEvent){
    	var intKeyCode = oEvent.keyCode;
    	if(!oEvent.altKey){
			switch(intKeyCode){
				case 32:
					this.slideshowIsPlaying = (this.slideshowIsPlaying)? false : true;
					if(this.slideshowIsPlaying){
						this.startSlideshow();
					}
					else{
						this.stopSlideshow();
					}
					this.preventDefaultEventBehavior(oEvent);
					break;
				case 37:
				case 38:
					this.previousImage();
					this.preventDefaultEventBehavior(oEvent);
					break;
				case 39:
				case 40:
					this.nextImage();
					this.preventDefaultEventBehavior(oEvent);
					break;
			}
		}
	},
	
	preventDefaultEventBehavior : function (oEvent){
		if(oEvent){
			oEvent.returnValue = false;
			if(oEvent.preventDefault){
				oEvent.preventDefault();
			}
		}
	}
};
// ---
addEvent(window, "load", function(){JaS.init();}, false);
addEvent(window, "unload", function(){JaS.closeSession();}, false);
// ---
// Utility functions
function addEvent(oObject, strEvent, oFunction, bCapture){
	if(oObject){
		if(oObject.addEventListener){
			oObject.addEventListener(strEvent, oFunction, bCapture);
		}
		else if(window.attachEvent){
			oObject.attachEvent(("on" + strEvent), oFunction)
		}
	}
}
// ---
function $(strId){
	return document.getElementById(strId);
}
// ---
if(typeof Array.prototype.push != "function"){
	Array.prototype.push = ArrayPush;
	function ArrayPush(value){
		this[this.length] = value;
	}
}
// ---