chg1 = new Image();
bk1 = new Image();

chg2 = new Image();
bk2 = new Image();

chg3 = new Image();
bk3 = new Image();

chg4 = new Image();
bk4 = new Image();

chg5 = new Image();
bk5 = new Image();

chg6 = new Image();
bk6 = new Image();

chg7 = new Image();
bk7 = new Image();

chg1.src = "images/abt01.gif";
bk1.src = "images/abt.gif";

chg2.src = "images/gta01.gif";
bk2.src = "images/gta.gif";

chg3.src = "images/cs01.gif";
bk3.src = "images/cs.gif";

chg4.src = "images/sem01.gif";
bk4.src = "images/sem.gif";

chg5.src = "images/art01.gif";
bk5.src = "images/art.gif";

chg6.src = "images/faq01.gif";
bk6.src = "images/faq.gif";

chg7.src = "images/visa01.gif";
bk7.src = "images/visa.gif";