tn1b = new Image(130, 30);
tn1b.src = "pix/menu1_a.gif";
tn2b = new Image(130, 30);
tn2b.src = "pix/menu2_a.gif";
tn3b = new Image(130, 30);
tn3b.src = "pix/menu3_a.gif";
tn4b = new Image(130, 30);
tn4b.src = "pix/menu4_a.gif";


tn1a = new Image(130, 30);
tn1a.src = "pix/menu1_b.gif";
tn2a = new Image(130, 30);
tn2a.src = "pix/menu2_b.gif";
tn3a = new Image(130, 30);
tn3a.src = "pix/menu3_b.gif";
tn4a = new Image(130, 30);
tn4a.src = "pix/menu4_b.gif";