a1 = new Image(); a1.src = "images/about1.png"; 
a2 = new Image(); a2.src = "images/about2.png";
b1 = new Image(); b1.src = "images/services1.png";
b2 = new Image(); b2.src = "images/services2.png";
c1 = new Image(); c1.src = "images/turnaround1.png";
c2 = new Image(); c2.src = "images/turnaround2.png";
d1 = new Image(); d1.src = "images/nutritional1.png";
d2 = new Image(); d2.src = "images/nutritional2.png"; 
e1 = new Image(); e1.src = "images/contact1.png";
e2 = new Image(); e2.src = "images/contact2.png";

function PicChange(ImageName,NewImage) {

//script to change the ImageName to NewImage
document.images[ImageName].src = eval(NewImage + ".src")}