n1off = new Image(130, 25);
n1off.src = "images/nav1.gif";
n2off = new Image(130, 25);
n2off.src = "images/nav2.gif";
n3off = new Image(130, 25);
n3off.src = "images/nav3.gif";
n4off = new Image(130, 25);
n4off.src = "images/nav4.gif";
n5off = new Image(130, 25);
n5off.src = "images/nav5.gif";
n6off = new Image(130, 25);
n6off.src = "images/nav6.gif";
n7off = new Image(130, 25);
n7off.src = "images/nav7.gif";
n8off = new Image(130, 25);
n8off.src = "images/nav8.gif";
n9off = new Image(130, 25);
n9off.src = "images/nav9.gif";

n1on = new Image(130, 25);
n1on.src = "images/nav1_o.gif";
n2on = new Image(130, 25);
n2on.src = "images/nav2_o.gif";
n3on = new Image(130, 25);
n3on.src = "images/nav3_o.gif";
n4on = new Image(130, 25);
n4on.src = "images/nav4_o.gif";
n5on = new Image(130, 25);
n5on.src = "images/nav5_o.gif";
n6on = new Image(130, 25);
n6on.src = "images/nav6_o.gif";
n7on = new Image(130, 25);
n7on.src = "images/nav7_o.gif";
n8on = new Image(130, 25);
n8on.src = "images/nav8_o.gif";
n9on = new Image(130, 25);
n9on.src = "images/nav9_o.gif";


a1off = new Image(130, 20);
a1off.src = "images/subnav_a1.gif";
a1on = new Image(130, 20);
a1on.src = "images/subnav_a1_o.gif";
a2off = new Image(130, 20);
a2off.src = "images/subnav_a2.gif";
a2on = new Image(130, 20);
a2on.src = "images/subnav_a2_o.gif";
a3off = new Image(130, 20);
a3off.src = "images/subnav_a3.gif";
a3on = new Image(130, 20);
a3on.src = "images/subnav_a3_o.gif";


p1off = new Image(130, 20);
p1off.src = "images/subnav_p1.gif";
p1on = new Image(130, 20);
p1on.src = "images/subnav_p1_o.gif";
p2off = new Image(130, 20);
p2off.src = "images/subnav_p2.gif";
p2on = new Image(130, 20);
p2on.src = "images/subnav_p2_o.gif";
p3off = new Image(130, 20);
p3off.src = "images/subnav_p3.gif";
p3on = new Image(130, 20);
p3on.src = "images/subnav_p3_o.gif";
p4off = new Image(130, 20);
p4off.src = "images/subnav_p4.gif";
p4on = new Image(130, 20);
p4on.src = "images/subnav_p4_o.gif";
p5off = new Image(130, 20);
p5off.src = "images/subnav_p5.gif";
p5on = new Image(130, 20);
p5on.src = "images/subnav_p5_o.gif";
p6off = new Image(130, 20);
p6off.src = "images/subnav_p6.gif";
p6on = new Image(130, 20);
p6on.src = "images/subnav_p6_o.gif";
p7off = new Image(130, 20);
p7off.src = "images/subnav_p7.gif";
p7on = new Image(130, 20);
p7on.src = "images/subnav_p7_o.gif";

v1off = new Image(75, 20);
v1off.src = "images/visiting_2001.gif";
v1on = new Image(75, 20);
v1on.src = "images/visiting_2001_on.gif";
v2off = new Image(75, 20);
v2off.src = "images/visiting_2002.gif";
v2on = new Image(75, 20);
v2on.src = "images/visiting_2002_on.gif";
v3off = new Image(75, 20);
v3off.src = "images/visiting_2003.gif";
v3on = new Image(75, 20);
v3on.src = "images/visiting_2003_on.gif";
v4off = new Image(75, 20);
v4off.src = "images/visiting_2004.gif";
v4on = new Image(75, 20);
v4on.src = "images/visiting_2004_on.gif";

pi1off = new Image(75, 20);
pi1off.src = "images/past_institutes_2001.gif";
pi1on = new Image(75, 20);
pi1on.src = "images/past_institutes_2001_on.gif";
pi2off = new Image(75, 20);
pi2off.src = "images/past_institutes_2002.gif";
pi2on = new Image(75, 20);
pi2on.src = "images/past_institutes_2002_on.gif";
pi3off = new Image(75, 20);
pi3off.src = "images/past_institutes_2003.gif";
pi3on = new Image(75, 20);
pi3on.src = "images/past_institutes_2003_on.gif";
pi4off = new Image(75, 20);
pi4off.src = "images/past_institutes_2004.gif";
pi4on = new Image(75, 20);
pi4on.src = "images/past_institutes_2004_on.gif";
pi5off = new Image(75, 20);
pi5off.src = "images/past_institutes_2005.gif";
pi5on = new Image(75, 20);
pi5on.src = "images/past_institutes_2005_on.gif";
pi6off = new Image(75, 20);
pi6off.src = "images/past_institutes_2006.gif";
pi6on = new Image(75, 20);
pi6on.src = "images/past_institutes_2006_on.gif";
pi7off = new Image(75, 20);
pi7off.src = "images/past_institutes_2007.gif";
pi7on = new Image(75, 20);
pi7on.src = "images/past_institutes_2007_on.gif";
pi8off = new Image(75, 20);
pi8off.src = "images/past_institutes_2008.gif";
pi8on = new Image(75, 20);
pi8on.src = "images/past_institutes_2008_on.gif";

function img_act(v) {
	document[v].src = eval(v + "on.src");
}
function img_inact(v) {
	document[v].src = eval(v + "off.src");
}