var img1  = new Image();
var img2  = new Image();
var img3  = new Image();
var img4  = new Image();
var img5  = new Image();
var img6  = new Image();
var img7  = new Image();
var img8  = new Image();
var img9  = new Image();
var img10 = new Image();
var img11 = new Image();
var img12 = new Image();
var img13  = new Image();
var img14  = new Image();
var img15  = new Image();
var img16  = new Image();
var img17  = new Image();
var img18  = new Image();

img1 .src = "photos/medthumbs/img1.jpg";
img2 .src = "photos/medthumbs/img2.jpg";
img3 .src = "photos/medthumbs/img3.jpg";
img4 .src = "photos/medthumbs/img4.jpg";
img5 .src = "photos/medthumbs/img5.jpg";
img6 .src = "photos/medthumbs/img6.jpg";
img7 .src = "photos/medthumbs/img7.jpg";
img8 .src = "photos/medthumbs/img8.jpg";
img9 .src = "photos/medthumbs/img9.jpg";
img10.src = "photos/medthumbs/img10.jpg";
img11.src = "photos/medthumbs/img11.jpg";
img12.src = "photos/medthumbs/img12.jpg";
img13 .src = "photos/medthumbs/img13.jpg";
img14 .src = "photos/medthumbs/img14.jpg";
img15 .src = "photos/medthumbs/img15.jpg";
img16 .src = "photos/medthumbs/img16.jpg";
img17 .src = "photos/medthumbs/img17.jpg";
img18 .src = "photos/medthumbs/img18.jpg";


function switchImage(imageName) {
    document.getElementById("m_thumb").src = eval(imageName + ".src");
}