//preload nav
n1 = new Image();
n1.src = "img/a1.gif";
n2 = new Image();
n2.src = "img/b1.gif";
n3 = new Image();
n3.src = "img/c1.gif";
n4 = new Image();
n4.src = "img/d1.gif";
n5 = new Image();
n5.src = "img/e1.gif";
n6 = new Image();
n6.src = "img/f1.gif";
n7 = new Image();
n7.src = "img/g1.gif";
n8 = new Image();
n8.src = "img/h1.gif";
n9 = new Image();
n9.src = "img/i1.gif";
n10 = new Image();
n10.src = "img/j1.gif";
n11 = new Image();
n11.src = "img/k1.gif";
n12 = new Image();
n12.src = "img/l1.gif";
n13 = new Image();
n13.src = "img/m1.gif";
n14 = new Image();
n14.src = "img/n1.gif";
n15 = new Image();
n15.src = "img/o1.gif";
n16 = new Image();
n16.src = "img/p1.gif";
n17 = new Image();
n17.src = "img/q1.gif";
n18 = new Image();
n18.src = "img/r1.gif";
n19 = new Image();
n19.src = "img/s1.gif";
n20 = new Image();
n20.src = "img/t1.gif";
n21 = new Image();
n21.src = "img/u1.gif";
n22 = new Image();
n22.src = "img/v1.gif";
n23 = new Image();
n23.src = "img/w1.gif";
n24 = new Image();
n24.src = "img/x1.gif";
n25 = new Image();
n25.src = "img/y1.gif";
n26 = new Image();
n26.src = "img/z1.gif";