// Javascript to go with estieg site portfolio. manages changing of main window and descriptive text
// when new Image is selected from thumbnail or portfolio is browsed via the arrow images.  

if (document.images) {
		illusText = new Image
		designText = new Image
		photoText = new Image
		resumeText = new Image
		contactText = new Image
		blankText = new Image
		
		illusText.src = "Images/label_illustration.gif"
		designText.src = "Images/label_design.gif"
		photoText.src = "Images/label_photo.gif"
		resumeText.src = "Images/label_resume.gif"
		contactText.src = "Images/label_contact.gif"
		blankText.src = "Images/label_blank.gif"
}

var thisPic = 0;				//Keeps track of the currently displayed picture.
								//array of all of the main images
myPix = new Array("Images/illus/elephant.jpg","Images/illus/giraffe.gif","Images/illus/butterflies.gif","Images/illus/bird_paradise.jpg","Images/illus/dragonflies.gif");	
var imgCt = myPix.length-1;		//the total number of images on the page, as determined from the array
var page = ""					//set on page loading to allow for generic use on different portfolio pages. 
	
function setPage(input) {		//run on load to set the current page being displayed.
	page = input;
	}
	
function selectNewText (index, line) {		//nested switch functions to select the page, the index/picture, and the line text for replacing the text to the left of the images.
	switch(page) {							//changes the text of one line; called from replaceLine
	
		case 'illustrations2':												//ILLUSTRATIONS 2
			switch(index) {
				case 1:											//INDEX #1
					switch(line) {
						case 1:
							return 'Card Design, Banyan Grove';	// LINE #1
						case 2:
							return 'Elephant card';	// LINE #2
						case 3:
							return 'digital media: Illustrator';	// LINE #3
					}
							
				case 2:											//INDEX #2
					switch(line) {
						case 1:
							return 'Card Design, Banyan Grove';	// LINE #1
						case 2:
							return 'Giraffe card';	// LINE #2
						case 3:
							return 'digital media: Illustrator';	// LINE #3
					}
									
				case 3:											//INDEX #3
					switch(line) {
						case 1:
							return 'Card Design, Banyan Grove';	// LINE #1
						case 2:
							return 'Butterfly card';	// LINE #2
						case 3:
							return 'digital media: Illustrator';	// LINE #3
					}
					
				case 4:											//INDEX #4
					switch(line) {
						case 1:
							return 'Card Design, Banyan Grove';	// LINE #1
						case 2:
							return 'Bird of Paradise card';	// LINE #2
						case 3:
							return 'digital media: Illustrator';	// LINE #3
					}
					
				case 5:											//INDEX #5
					switch(line) {
						case 1:
							return 'Card Design, Banyan Grove';	// LINE #1
						case 2:
							return 'Dragonfly card';	// LINE #2
						case 3:
							return 'digital media: Illustrator';	// LINE #3
					}				

					
				default:
					return 'defaulted at index';
				}
		default:
			return 'defaulted at page';
		}	
}
													
function replaceLine(n, index, line) {				// THERE WILL BE PROBLEMS IS TEXT IS SEPARATED WITH ANY OTHER TAGS.
													//finds the text node and then replaces it with the new text returned from selectNewText
	if (n.nodeType == 3 /*Node.TEXT_NODE*/) {
		var newNode = document.createTextNode(n);	
		var parent = n.parentNode;
		newNode.data = selectNewText(index, line);	//set the data for the new node to that looked up in selectNewText based on the picture index value and the line value.				
		parent.replaceChild(newNode, n);			//replace the old node with this new one.
	}
	else {
		var kids = n.childNodes;					//necessary to iterate through to get to the text node.
		for (var i = 0; i< kids.length; i++) replaceLine(kids[i], index, line);
	}
}

function replaceText(index) {						//Given the new picture index, calls replaceLine to find new text and replace old text
													//currently hardcoded for 3 lines of text.
	for (var line = 1; line < 4; line++) replaceLine(document.getElementById('l' + line), index, line);
		
}

function chgImg(imgField,newImg) {					//rollovers for menu items at top of page
	if (document.images) {
		document[imgField].src= eval(newImg + ".src");
	}
}

function chgMainImg(imgField,index) {				//changes main image and text when thumbnail is selected
	if (document.images) {
		thisPic = index - 1;						//updates thisPic value to newly selected picture
		document[imgField].src= myPix[thisPic];		//selects new image source from myPix array based on thisPic index
		replaceText(index);							//updates text for newly selected pic
	}
}
	
function chgSlide(direction) {						//iterates through pics in main window starting from currently shown pic
	if (document.images) {
		thisPic = thisPic + direction				//new pic is either one up or one down in the array
		if (thisPic > imgCt) {						//go to beginning if trying to go past the end
			thisPic = 0
		}
		if (thisPic < 0) {							//go to end if trying to go back from the beginning
			thisPic = imgCt
		}
		document.myPicture.src=myPix[thisPic]		//show this new pic in main window
		replaceText(thisPic + 1);					//update text to go with this new picture
	}
}