a=new Image(80,40);a.src="images/navi01b.jpg";
a2=new Image(80,40);a2.src="images/navi01a.jpg";
b=new Image(185,40);b.src="images/navi02b.jpg";
b2=new Image(185,40);b2.src="images/navi02a.jpg";
c=new Image(90,40);c.src="images/navi03b.jpg";
c2=new Image(90,40);c2.src="images/navi03a.jpg";
d=new Image(165,40);d.src="images/navi04b.jpg";
d2=new Image(165,40);d2.src="images/navi04a.jpg";
e=new Image(120,40);e.src="images/navi05b.jpg";
e2=new Image(120,40);e2.src="images/navi05a.jpg";