// Type the number of images you are rotating.

NumberOfImagesToRotate = 14;

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

FirstPart = '<img src="employment_gallery/t_th_';
LastPart = '.jpg" height="149" width="178">';

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

printImage();