Script 13.6

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// This file contains the JavaScript for animating portfolio category buttons.
// It is used by both cat_change.html & workbook.port.intro.fcgi
// This script copyright 1997, The Workbook.
// This script appeared in "JavaScript for the WWW, Visual QuickStart Guide, 2nd Edition."
// This script may be used and modified, but the copyright notice must remain intact.

var firstTime = 1

photoButton = new Array
illButton = new Array
digButton = new Array
designButton = new Array
repButton = new Array
imgArray = new Array

for (i=0; i<2; i++) {
	photoButton[i] = new Image
	illButton[i] = new Image
	digButton[i] = new Image
	designButton[i] = new Image
	repButton[i] = new Image
}
		
// Pre-load the animated graphics
if (document.images) {
	photoButton[0].src = "http://www.workbook.com/img/photo/button_00.jpg"
	photoButton[1].src = "http://www.workbook.com/img/photo/button_01.jpg"
	illButton[0].src = "http://www.workbook.com/img/ill/button_00.jpg"
	illButton[1].src = "http://www.workbook.com/img/ill/button_01.jpg"
		
	digButton[0].src = "http://www.workbook.com/img/digital/button_00.jpg"
	digButton[1].src = "http://www.workbook.com/img/digital/button_01.jpg"

designButton[0].src = "http://www.workbook.com/img/design/button_00.jpg"
	designButton[1].src = "http://www.workbook.com/img/design/button_01.jpg"

repButton[0].src = "http://www.workbook.com/img/reps/button_00.jpg"
	repButton[1].src = "http://www.workbook.com/img/reps/button_01.jpg"
		
	imgArray = new Array(photoButton[0], photoButton[1], illButton[0], illButton[1], designButton[0], designButton[1], digButton[0], digButton[1], repButton[0], repButton[1])
}
else {
	document.photo = ""
	document.ill = ""
	document.dig = ""
	document.design = ""
	document.rep = ""
}

function rotate() {
	if (firstTime == 1) {
		buttonArray = new Array(document.photo, document.ill, document.design, document.dig, document.rep)
		lastButton = -1
		firstTime = 0
	}
		
	randomImg = Math.floor(Math.random() * 10)
	randomButton = Math.floor(randomImg / 2)
	if (lastButton != randomButton) {
		buttonArray[randomButton].src = imgArray[randomImg].src
		lastButton = randomButton
	}	       
	setTimeout('rotate()',200)
}