photo01on=new Image();
photo01on.src="images/photo01.jpg";
photo02on=new Image();
photo02on.src="images/photo02.jpg";
photo03on=new Image();
photo03on.src="images/photo03.jpg";
photo04on=new Image();
photo04on.src="images/photo04.jpg";
photo05on=new Image();
photo05on.src="images/photo05.jpg";
photo06on=new Image();
photo06on.src="images/photo06.jpg";
photo07on=new Image();
photo07on.src="images/photo07.jpg";
photo08on=new Image();
photo08on.src="images/photo08.jpg";
photo09on=new Image();
photo09on.src="images/photo09.jpg";
photo10on=new Image();
photo10on.src="images/photo10.jpg";
photo11on=new Image();
photo11on.src="images/photo11.jpg";
photo12on=new Image();
photo12on.src="images/photo12.jpg";
photo13on=new Image();
photo13on.src="images/photo13.jpg";
photo14on=new Image();
photo14on.src="images/photo14.jpg";
photo15on=new Image();
photo15on.src="images/photo15.jpg";
photo16on=new Image();
photo16on.src="images/photo16.jpg";
photo17on=new Image();
photo17on.src="images/photo17.jpg";

function onImg(imgName,imgNum){
document[imgNum].src=eval(imgName+"on.src");
}

function offImg(imgNum){
document[imgNum].src=eval(imgNum+"off.src");
}