var image1 = new Image();
var image2 = new Image();
var image3 = new Image();
var image4 = new Image();
var image5 = new Image();
var image6 = new Image();
var image7 = new Image();
var image8 = new Image();
var image9 = new Image();
var image10 = new Image();
var image11 = new Image();
var image12 = new Image();
var image13 = new Image();
var image14 = new Image();
var image15 = new Image();
var image16 = new Image();
var image17 = new Image();
var image18 = new Image();

image1.src = "photos/location/image_1.png";
image2.src = "photos/location/image_2.jpg";
image3.src = "photos/location/image_3.jpg";
image4.src = "photos/location/image_4.jpg";
image5.src = "photos/location/image_5.jpg";
image6.src = "photos/location/image_6.jpg";
image7.src = "photos/location/image_7.jpg";
image8.src = "photos/location/image_8.jpg";
image9.src = "photos/location/image_9.jpg";
image10.src = "photos/location/image_10.jpg";
image11.src = "photos/location/image_11.jpg";
image12.src = "photos/location/image_12.jpg";
image13.src = "photos/location/image_13.jpg";
image14.src = "photos/location/image_14.jpg";
image15.src = "photos/location/image_15.jpg";
image16.src = "photos/location/image_16.jpg";

function doButtons(picimage) {
eval("document['picture'].src = " + picimage + ".src");
}