a=new Image(50,21);a.src="../images/navi01b.gif";
a2=new Image(50,21);a2.src="../images/navi01a.gif";
b=new Image(125,21);b.src="../images/navi02b.gif";
b2=new Image(125,21);b2.src="../images/navi02a.gif";
c=new Image(60,21);c.src="../images/navi03b.gif";
c2=new Image(60,21);c2.src="../images/navi03a.gif";
d=new Image(50,21);d.src="../images/navi04b.gif";
d2=new Image(50,21);d2.src="../images/navi04a.gif";
e=new Image(55,21);e.src="../images/navi05b.gif";
e2=new Image(55,21);e2.src="../images/navi05a.gif";
f=new Image(75,21);f.src="../images/navi06b.gif";
f2=new Image(75,21);f2.src="../images/navi06a.gif";
g=new Image(80,21);g.src="../images/navi07b.gif";
g2=new Image(80,21);g2.src="../images/navi07a.gif";