s1on = new Image(76,17);
s1on.src = "art/subnav_prologue_1.gif";
s1off = new Image(76,17);
s1off.src = "art/subnav_prologue_0.gif";

s2on = new Image(82,17);
s2on.src = "art/subnav_previous_1.gif";
s2off = new Image(82,17);
s2off.src = "art/subnav_previous_0.gif";

s3on = new Image(58,17);
s3on.src = "art/subnav_next_1.gif";
s3off = new Image(58,17);
s3off.src = "art/subnav_next_0.gif";

s4on = new Image(58,17);
s4on.src = "art/subnav_index_1.gif";
s4off = new Image(58,17);
s4off.src = "art/subnav_index_0.gif";

s6on = new Image(82,17);
s6on.src = "art/subnav_previous_1.gif";
s6off = new Image(82,17);
s6off.src = "art/subnav_previous_0.gif";

s7on = new Image(58,17);
s7on.src = "art/subnav_next_1.gif";
s7off = new Image(58,17);
s7off.src = "art/subnav_next_0.gif";

s8on = new Image(82,17);
s8on.src = "art/subnav_previous_1.gif";
s8off = new Image(82,17);
s8off.src = "art/subnav_previous_0.gif";

s9on = new Image(58,17);
s9on.src = "art/subnav_next_1.gif";
s9off = new Image(58,17);
s9off.src = "art/subnav_next_0.gif";

function sub_on(i) {

		sTag = "s" + i;
		document [sTag].src = eval(sTag + "on.src");
		return;

}

function sub_off(i) {

		sTag = "s" + i;
		document [sTag].src = eval(sTag + "off.src");
		return;

}