function image() {
};

image = new image();
number = 0;

image[number++] = "<img src='images/l1.jpg' alt='Passive Remediation Systems' class='lphoto'>"
image[number++] = "<img src='images/l2.jpg' alt='Passive Remediation Systems' class='lphoto'>"
image[number++] = "<img src='images/l3.jpg' alt='Passive Remediation Systems' class='lphoto'>"
image[number++] = "<img src='images/l4.jpg' alt='Passive Remediation Systems' class='lphoto'>"
image[number++] = "<img src='images/l5.jpg' alt='Passive Remediation Systems' class='lphoto'>"
image[number++] = "<img src='images/l8.jpg' alt='Passive Remediation Systems' class='lphoto'>"

increment = Math.floor(Math.random() * number);

document.write(image[increment]);