if (document.images)
{
chicago_citynav = new Image;
chicago_citynav_roll = new Image;
chicago_southsidenav = new Image;
chicago_southsidenav_roll = new Image;
southern_subsnav = new Image;
southern_subsnav_roll = new Image;
northern_subsnav = new Image;
northern_subsnav_roll = new Image;
northwestern_subsnav = new Image;
northwestern_subsnav_roll = new Image;
western_subsnav = new Image;
western_subsnav_roll = new Image;
indiananav = new Image;
indiananav_roll = new Image;

chicago_citynav.src="../image/chicago_city.gif";
chicago_citynav_roll.src="../image/chicago_city_roll.gif";
chicago_southsidenav.src="../image/chicago_southside.gif";
chicago_southsidenav_roll.src="../image/chicago_southside_roll.gif";
northern_subsnav.src="../image/northern_subs.gif";
northern_subsnav_roll.src="../image/northern_subs_roll.gif";
northwestern_subsnav.src="../image/northwestern_subs.gif";
northwestern_subsnav_roll.src="../image/northwestern_subs_roll.gif";
southern_subsnav.src="../image/southern_subs.gif";
southern_subsnav_roll.src="../image/southern_subs_roll.gif";
western_subsnav.src="../image/western_subs.gif";
western_subsnav_roll.src="../image/western_subs_roll.gif";
indiananav.src="../image/indiana.gif";
indiananav_roll.src="../image/indiana_roll.gif";
}

else
{
chicago_citynav = "";
chicago_citynav_roll = "";
document.chicago_city.src = "";
chicago_southsidenav = "";
chicago_southsidenav_roll = "";
document.chicago_southside.src = "";
northern_subsnav = "";
northern_subsnav_roll = "";
document.northern_subs.src = "";
northwestern_subsnav = "";
northwestern_subsnav_roll = "";
document.northwestern_subs.src = "";
western_subsnav = "";
western_subsnav_roll = "";
document.western_subs.src = "";
southern_subsnav = "";
southern_subsnav_roll = "";
document.southern_subs.src = "";
indiananav = "";
indiananav_roll = "";
document.indiana.src = "";
}