var a = new Image();
a.src = "images/navbar/structure1.gif";

var b = new Image();
b.src = "images/navbar/history1.gif";

var c = new Image();
c.src = "images/navbar/applications1.gif";

var d = new Image();
d.src = "images/navbar/classes1.gif";

var e = new Image();
e.src = "images/navbar/iq1.gif";

var f = new Image();
f.src = "images/navbar/game1.gif";

var g = new Image();
g.src = "images/navbar/home1.gif";