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/*
JavaScript Programming for the Absolute Beginner
by Andy Harris
Publisher: Muska & Lipman/Premier-Trade
Language: English
ISBN: 0761534105
*/
<html>
<head>
<title>Image Array Demo</title>
<script>
var description = new Array("blank", "triangle", "circle", "square");
var pictures = new Array(3);
var counter = 0;
function initialize(){
// sets up the array with some startin values
// Andy Harris
pictures[0] = new Image(50, 50);
pictures[0].src = "blank.gif";
pictures[1] = new Image(50, 50);
pictures[1].src = "triangle.gif";
pictures[2] = new Image(50, 50);
pictures[2].src = "circle.gif";
pictures[3] = new Image(50, 50);
pictures[3].src = "square.gif";
} // end initialize
function upDate(){
//increments the counter and shows the next description
counter++;
if (counter > 3){
counter = 0;
} // end if
document.imgDisplay.src = pictures[counter].src;
document.myForm.txtDescription.value = description[counter];
} // end upDate
</script>
</head>
<body onLoad = "initialize()">
<center>
<h1>Image Array Demo<hr></h1>
<form name = "myForm">
<img src = "blank.gif"
name = "imgDisplay"
height = 100
width = 100>
<br>
<input type = "text"
name = "txtDescription"
value = "blank">
<br>
<input type = "button"
value = "next"
onClick = "upDate()">
</form>
</center>
<hr>
</body>
</html>
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