var button1on = new Image();
button1on.src = "images/1on.gif";
var button1out = new Image();
button1out.src = "images/1off.gif";

var button2on = new Image();
button2on.src = "images/2on.gif";
var button2out = new Image();
button2out.src = "images/2off.gif";

var button3on = new Image();
button3on.src = "images/3on.gif";
var button3out = new Image();
button3out.src = "images/3off.gif";

var button4on = new Image();
button4on.src = "images/4on.gif";
var button4out = new Image();
button4out.src = "images/4off.gif";