// Type the number of images you are rotating.

NumberOfImagesToRotate = 20;

// Specify the first and last part of the image tag. 

FirstPart = '<img src="http://www.evaluationmauricie.com/includes/house/img';
LastPart = '.jpg" width="320" height="200">';

function printImage() {
var r = Math.ceil(Math.random() * NumberOfImagesToRotate);
document.write(FirstPart + r + LastPart);
}